/* roulang page: index */
:root{
  --c-primary:#2C4A46;
  --c-primary-dark:#203634;
  --c-primary-soft:#E7EDEA;
  --c-accent:#C2703D;
  --c-accent-dark:#A85D2F;
  --c-bg:#FAF9F6;
  --c-surface:#FFFFFF;
  --c-ink:#16191C;
  --c-ink-2:#3A4147;
  --c-muted:#6B7480;
  --c-line:#E3E1DC;
  --r-btn:6px;
  --r-card:12px;
  --r-chip:999px;
  --r-img:12px;
  --sh-1:0 1px 2px rgba(20,25,30,.04), 0 10px 28px -18px rgba(20,25,30,.18);
  --sh-2:0 2px 6px rgba(20,25,30,.06), 0 18px 40px -20px rgba(20,25,30,.24);
  --ease:cubic-bezier(.2,.7,.3,1);
  --sec-y:96px;
  --container:1240px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color .2s var(--ease);}
a:hover{color:var(--c-primary);}
button,input,textarea,select{font:inherit;color:inherit;}
h1,h2,h3,h4{margin:0;font-weight:700;color:var(--c-ink);line-height:1.2;letter-spacing:-.01em;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--c-accent);outline-offset:2px;border-radius:4px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding-left:24px;padding-right:24px;}
.yk-num{font-variant-numeric:tabular-nums;}

/* ---------- Header / Nav ---------- */
.yk-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(250,249,246,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--c-line);
  transition:box-shadow .22s var(--ease),transform .22s var(--ease),background .22s var(--ease);
}
.yk-header.is-scrolled{box-shadow:var(--sh-1);background:rgba(255,255,255,.96);}
.yk-header.is-hidden{transform:translateY(-100%);}
.yk-topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:72px;}
.yk-logo{display:inline-flex;align-items:center;gap:10px;}
.yk-logo-mark{
  width:34px;height:34px;border-radius:9px;flex:0 0 auto;
  background:linear-gradient(140deg,var(--c-primary),#3C625C);
  color:#fff;display:grid;place-items:center;
  font-size:16px;font-weight:800;letter-spacing:0;
}
.yk-logo-text{font-size:19px;font-weight:700;letter-spacing:.01em;color:var(--c-ink);}
.yk-logo:hover .yk-logo-text{color:var(--c-primary);}
.yk-topbar-right{display:flex;align-items:center;gap:12px;}
.yk-topnav{display:flex;align-items:center;gap:22px;margin-right:8px;}
.yk-topnav a{font-size:14px;color:var(--c-ink-2);position:relative;}
.yk-topnav a::after{
  content:"";position:absolute;left:0;bottom:-4px;height:2px;width:0;background:var(--c-accent);
  transition:width .22s var(--ease);
}
.yk-topnav a:hover::after,.yk-topnav a.is-active::after{width:100%;}
.yk-segnav{border-top:1px solid var(--c-line);}
.yk-segnav-inner{
  display:flex;align-items:center;gap:8px;padding-top:10px;padding-bottom:12px;
  overflow-x:auto;scrollbar-width:none;
}
.yk-segnav-inner::-webkit-scrollbar{display:none;}
.yk-chip{
  flex:0 0 auto;display:inline-flex;align-items:center;gap:6px;
  padding:8px 16px;border-radius:var(--r-chip);
  background:var(--c-primary-soft);color:var(--c-ink-2);
  font-size:14px;line-height:1.4;white-space:nowrap;
  border:1px solid transparent;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.yk-chip:hover{background:#DCE5E1;color:var(--c-primary);}
.yk-chip.is-active{background:var(--c-primary);color:#fff;}
.yk-chip.is-active:hover{background:var(--c-primary-dark);color:#fff;}
.yk-nav-toggle{
  display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:40px;border:1px solid var(--c-line);border-radius:var(--r-btn);
  background:var(--c-surface);padding:0 11px;
}
.yk-nav-toggle span{display:block;height:2px;background:var(--c-ink-2);border-radius:2px;transition:transform .2s var(--ease);}
.yk-mobile-nav{border-top:1px solid var(--c-line);background:var(--c-surface);padding:14px 0 18px;}
.yk-mobile-nav .yk-mobile-list{display:flex;flex-wrap:wrap;gap:8px;}
.yk-mobile-nav .yk-mobile-contact{margin-top:14px;font-size:14px;color:var(--c-muted);}

/* ---------- Buttons ---------- */
.yk-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--r-btn);border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1.3;cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.yk-btn:active{transform:translateY(0);}
.yk-btn-primary{background:var(--c-primary);color:#fff;box-shadow:var(--sh-1);}
.yk-btn-primary:hover{background:var(--c-primary-dark);color:#fff;transform:translateY(-2px);box-shadow:var(--sh-2);}
.yk-btn-ghost{background:transparent;color:var(--c-primary);border-color:var(--c-primary);}
.yk-btn-ghost:hover{background:var(--c-primary-soft);color:var(--c-primary);transform:translateY(-2px);}
.yk-btn-light{background:var(--c-surface);color:var(--c-primary);border-color:var(--c-line);}
.yk-btn-light:hover{border-color:var(--c-primary);color:var(--c-primary);transform:translateY(-2px);}
.yk-btn-sm{padding:9px 16px;font-size:14px;}
.yk-link{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--c-primary);font-weight:600;font-size:15px;position:relative;
}
.yk-link::after{
  content:"";position:absolute;left:0;bottom:-3px;height:1px;width:0;background:var(--c-primary);
  transition:width .22s var(--ease);
}
.yk-link:hover::after{width:100%;}
.yk-link i{transition:transform .2s var(--ease);}
.yk-link:hover i{transform:translateX(3px);}

/* ---------- Section basics ---------- */
.yk-main{display:block;}
.yk-section{padding:var(--sec-y) 0;}
.yk-section-tight{padding:64px 0;}
.yk-section-head{margin-bottom:40px;max-width:760px;}
.yk-section-head--row{
  display:flex;align-items:flex-end;justify-content:space-between;gap:24px;max-width:none;flex-wrap:wrap;
}
.yk-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;letter-spacing:.06em;color:var(--c-primary);
  background:var(--c-primary-soft);border-radius:var(--r-chip);padding:6px 14px;margin-bottom:18px;
}
.yk-h2{font-size:clamp(26px,3.4vw,38px);line-height:1.22;}
.yk-h3{font-size:22px;line-height:1.35;}
.yk-lead{font-size:16px;color:var(--c-ink-2);margin-top:16px;}
.yk-muted{color:var(--c-muted);font-size:14px;}
.yk-rule{height:1px;background:var(--c-line);border:0;margin:0;}

/* ---------- Hero ---------- */
.yk-hero{padding:72px 0 56px;position:relative;overflow:hidden;}
.yk-hero::before{
  content:"";position:absolute;inset:0;
  background-image:url("/assets/images/backpic/back-2.webp");
  background-size:cover;background-position:center right;
  opacity:.07;pointer-events:none;
}
.yk-hero .container{position:relative;}
.yk-hero h1{font-size:clamp(34px,5vw,54px);line-height:1.15;margin-top:4px;}
.yk-hero-sub{font-size:clamp(17px,1.7vw,20px);color:var(--c-primary);margin-top:18px;font-weight:600;}
.yk-hero-desc{color:var(--c-ink-2);font-size:16px;margin-top:14px;max-width:560px;}
.yk-hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:20px;margin-top:30px;}
.yk-hero-media{position:relative;border-radius:var(--r-img);overflow:hidden;box-shadow:var(--sh-1);margin:0;}
.yk-hero-media img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.yk-hero-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(44,74,70,0) 45%,rgba(22,25,28,.42) 100%);
}
.yk-hero-caption{
  position:absolute;left:20px;right:20px;bottom:18px;z-index:2;color:#fff;
  font-size:14px;display:flex;align-items:center;gap:8px;
}
.yk-hero-metrics{
  margin-top:48px;padding-top:22px;border-top:1px solid var(--c-line);
  display:flex;flex-wrap:wrap;gap:32px;
}
.yk-hero-metrics span{font-size:14px;color:var(--c-ink-2);display:inline-flex;align-items:center;gap:8px;}
.yk-hero-metrics span::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--c-accent);display:inline-block;
}

/* ---------- Service list ---------- */
.yk-svc-list{border-top:1px solid var(--c-line);}
.yk-svc-item{
  display:flex;align-items:flex-start;gap:28px;
  padding:28px 18px;border-bottom:1px solid var(--c-line);
  border-radius:var(--r-card);
  transition:background .22s var(--ease),padding .22s var(--ease);
}
.yk-svc-item:hover{background:var(--c-primary-soft);padding-left:26px;}
.yk-svc-idx{
  flex:0 0 auto;font-size:clamp(28px,3.4vw,42px);font-weight:800;line-height:1;
  color:#C9D5D0;letter-spacing:-.02em;transition:color .22s var(--ease);
  font-variant-numeric:tabular-nums;min-width:64px;
}
.yk-svc-item:hover .yk-svc-idx{color:var(--c-accent);}
.yk-svc-title{font-size:20px;font-weight:700;}
.yk-svc-desc{color:var(--c-ink-2);font-size:15px;margin-top:8px;max-width:760px;}

/* ---------- Stats ---------- */
.yk-stats{background:var(--c-surface);border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);}
.yk-stats-grid{display:grid;grid-template-columns:repeat(4,1fr);}
.yk-stat{
  padding:40px 24px;text-align:left;border-left:1px solid var(--c-line);
}
.yk-stat:first-child{border-left:0;}
.yk-stat-num{
  font-size:clamp(28px,4vw,44px);font-weight:800;line-height:1;
  color:var(--c-primary);font-variant-numeric:tabular-nums;letter-spacing:-.02em;
}
.yk-stat-num small{font-size:.45em;font-weight:700;margin-left:4px;color:var(--c-primary);}
.yk-stat-label{margin-top:12px;font-size:15px;font-weight:600;color:var(--c-ink);}
.yk-stat-note{margin-top:6px;font-size:13px;color:var(--c-muted);}

/* ---------- Cases ---------- */
.yk-cases{display:grid;grid-template-columns:1.45fr 1fr;gap:24px;}
.yk-case{
  position:relative;border-radius:var(--r-card);overflow:hidden;
  box-shadow:var(--sh-1);display:block;
}
.yk-case img{width:100%;height:100%;object-fit:cover;transition:transform .26s var(--ease);}
.yk-case:hover img{transform:scale(1.03);}
.yk-case::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(22,25,28,.02) 40%,rgba(22,25,28,.66) 100%);
  transition:background .26s var(--ease);
}
.yk-case:hover::after{background:linear-gradient(180deg,rgba(22,25,28,.12) 30%,rgba(22,25,28,.78) 100%);}
.yk-case-text{position:absolute;left:22px;right:22px;bottom:20px;z-index:2;color:#fff;}
.yk-case-text h3{color:#fff;font-size:19px;}
.yk-case-text p{font-size:13px;color:rgba(255,255,255,.82);margin-top:6px;}
.yk-case--large{min-height:420px;}
.yk-case--small{min-height:198px;}
.yk-case-stack{display:grid;grid-template-rows:1fr 1fr;gap:24px;}

/* ---------- Plan (alternating) ---------- */
.yk-plan-row{
  display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;
  padding:40px 0;border-bottom:1px solid var(--c-line);
}
.yk-plan-row:last-child{border-bottom:0;}
.yk-plan-row.is-rev .yk-plan-media{order:2;}
.yk-plan-media{margin:0;border-radius:var(--r-img);overflow:hidden;box-shadow:var(--sh-1);}
.yk-plan-media img{width:100%;aspect-ratio:16/10;object-fit:cover;}
.yk-plan-step{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;
  color:var(--c-accent);letter-spacing:.06em;margin-bottom:14px;
}
.yk-plan-step::before{content:"";width:26px;height:2px;background:var(--c-accent);display:inline-block;}
.yk-plan-list{margin-top:18px;display:grid;gap:10px;}
.yk-plan-list li{position:relative;padding-left:22px;color:var(--c-ink-2);font-size:15px;}
.yk-plan-list li::before{
  content:"";position:absolute;left:0;top:11px;width:10px;height:2px;background:var(--c-primary);
}

/* ---------- News / CMS ---------- */
.yk-news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.yk-card{
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-card);
  overflow:hidden;display:flex;flex-direction:column;height:100%;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.yk-card:hover{transform:translateY(-2px);box-shadow:var(--sh-1);border-color:#C7D6D0;}
.yk-card-thumb{position:relative;overflow:hidden;background:var(--c-primary-soft);}
.yk-card-thumb img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .26s var(--ease);}
.yk-card:hover .yk-card-thumb img{transform:scale(1.03);}
.yk-card-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1 1 auto;}
.yk-tag{
  display:inline-flex;align-items:center;gap:6px;align-self:flex-start;
  font-size:12px;letter-spacing:.06em;color:var(--c-primary);
  background:var(--c-primary-soft);border-radius:var(--r-chip);padding:4px 12px;
}
.yk-card-title{font-size:18px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.yk-card:hover .yk-card-title{color:var(--c-primary);}
.yk-card-text{
  font-size:14px;color:var(--c-muted);display:-webkit-box;-webkit-line-clamp:2;
  -webkit-box-orient:vertical;overflow:hidden;
}
.yk-card-meta{
  margin-top:auto;padding-top:14px;border-top:1px solid var(--c-line);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-size:13px;color:var(--c-muted);
}
.yk-empty{
  grid-column:1/-1;max-height:320px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
  padding:56px 24px;background:var(--c-surface);border:1px dashed var(--c-line);border-radius:var(--r-card);
  text-align:center;
}
.yk-empty p{color:var(--c-muted);font-size:15px;}

/* ---------- FAQ ---------- */
.yk-faq .accordion-item{
  background:transparent;border:0;border-bottom:1px solid var(--c-line);border-radius:0;
}
.yk-faq .accordion-button{
  background:transparent;box-shadow:none;border-radius:0;
  padding:22px 0;font-size:17px;font-weight:600;color:var(--c-ink);
  min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.yk-faq .accordion-button:not(.collapsed){color:var(--c-primary);background:transparent;}
.yk-faq .accordion-button::after{display:none;}
.yk-faq .accordion-button:focus{box-shadow:none;}
.yk-faq .accordion-button:hover{color:var(--c-primary);}
.yk-faq .accordion-body{
  padding:0 0 24px;color:var(--c-ink-2);font-size:15px;
  background:var(--c-primary-soft);border-radius:var(--r-card);
  padding-left:20px;padding-right:20px;margin-bottom:18px;
}
.yk-plus{
  flex:0 0 auto;position:relative;width:18px;height:18px;
}
.yk-plus::before,.yk-plus::after{
  content:"";position:absolute;background:var(--c-primary);border-radius:2px;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.yk-plus::before{left:0;top:8px;width:18px;height:2px;}
.yk-plus::after{top:0;left:8px;width:2px;height:18px;}
.accordion-button:not(.collapsed) .yk-plus::after{transform:rotate(90deg);opacity:0;}
.accordion-button:not(.collapsed) .yk-plus::before{background:var(--c-accent);}

/* ---------- Contact ---------- */
.yk-contact{background:var(--c-primary-soft);}
.yk-info-card{
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-card);
  padding:28px;height:100%;
}
.yk-info-item{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--c-line);}
.yk-info-item:last-child{border-bottom:0;padding-bottom:0;}
.yk-info-item i{color:var(--c-primary);font-size:16px;margin-top:4px;}
.yk-info-item h3{font-size:15px;font-weight:700;}
.yk-info-item p{font-size:14px;color:var(--c-muted);margin-top:4px;}
.yk-form-card{
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-card);
  padding:28px;box-shadow:var(--sh-1);
}
.yk-form-card .form-label{font-size:14px;font-weight:600;color:var(--c-ink-2);margin-bottom:6px;}
.yk-form-card .form-control{
  height:48px;border-radius:var(--r-btn);border:1px solid var(--c-line);
  background:#FCFCFB;font-size:15px;padding:0 14px;box-shadow:none;
}
.yk-form-card textarea.form-control{height:auto;padding:12px 14px;resize:vertical;}
.yk-form-card .form-control:focus{border-color:var(--c-primary);box-shadow:none;background:#fff;}
.yk-form-card .form-control::placeholder{color:#9AA2AA;}
.yk-form-hint{font-size:13px;color:var(--c-muted);margin-top:8px;}
.yk-form-success{
  display:none;margin-top:16px;padding:14px 16px;border-radius:var(--r-btn);
  background:var(--c-primary-soft);color:var(--c-primary);font-size:14px;
}
.yk-form-success.is-visible{display:block;}

/* ---------- Footer ---------- */
.yk-footer{border-top:1px solid var(--c-line);background:var(--c-bg);padding-top:64px;}
.yk-footer-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px;
}
.yk-footer h4{font-size:15px;font-weight:700;margin-bottom:18px;}
.yk-footer p{font-size:14px;color:var(--c-muted);}
.yk-footer-links{display:grid;gap:12px;}
.yk-footer-links a{font-size:14px;color:var(--c-muted);position:relative;display:inline-block;}
.yk-footer-links a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1px;width:0;background:var(--c-primary);
  transition:width .22s var(--ease);
}
.yk-footer-links a:hover{color:var(--c-primary);}
.yk-footer-links a:hover::after{width:100%;}
.yk-footer-brand{display:inline-flex;align-items:center;gap:10px;margin-bottom:16px;}
.yk-footer-bottom{
  border-top:1px solid var(--c-line);padding:20px 0;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--c-muted);
}

/* ---------- Reveal / motion ---------- */
.yk-reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease);}
.yk-reveal.is-in{opacity:1;transform:none;}

/* ---------- Responsive ---------- */
@media (max-width:1199.98px){
  :root{--sec-y:80px;}
  .yk-plan-row{gap:36px;}
}
@media (max-width:991.98px){
  :root{--sec-y:72px;}
  .yk-hero{padding:52px 0 44px;}
  .yk-cases{grid-template-columns:1fr;}
  .yk-case--large{min-height:320px;}
  .yk-case-stack{grid-template-rows:none;grid-template-columns:1fr 1fr;}
  .yk-case--small{min-height:200px;}
  .yk-plan-row{grid-template-columns:1fr;gap:24px;padding:32px 0;}
  .yk-plan-row.is-rev .yk-plan-media{order:0;}
  .yk-news-grid{grid-template-columns:repeat(2,1fr);}
  .yk-footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .yk-stats-grid{grid-template-columns:repeat(2,1fr);}
  .yk-stat{border-left:0;border-top:1px solid var(--c-line);}
  .yk-stat:nth-child(1),.yk-stat:nth-child(2){border-top:0;}
}
@media (max-width:767.98px){
  :root{--sec-y:48px;--r-card:10px;}
  .container{padding-left:18px;padding-right:18px;}
  .yk-hero h1{font-size:clamp(28px,7.4vw,38px);}
  .yk-hero-metrics{gap:18px;margin-top:32px;}
  .yk-svc-item{gap:16px;padding:22px 12px;}
  .yk-svc-idx{min-width:44px;font-size:26px;}
  .yk-svc-item:hover{padding-left:16px;}
  .yk-case-stack{grid-template-columns:1fr;}
  .yk-footer-grid{grid-template-columns:1fr;gap:28px;}
  .yk-news-grid{grid-template-columns:1fr;}
  .yk-footer-bottom{justify-content:flex-start;}
}
@media (max-width:575.98px){
  .yk-stats-grid{grid-template-columns:1fr;}
  .yk-stat{border-top:1px solid var(--c-line);}
  .yk-stat:nth-child(1){border-top:0;}
  .yk-hero-actions{gap:14px;}
  .yk-btn{width:100%;}
  .yk-hero-actions .yk-link{width:100%;justify-content:flex-start;}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;}
  .yk-reveal{opacity:1;transform:none;}
  html{scroll-behavior:auto;}
}

/* roulang page: article */
:root{
  --c-primary:#2C4A46;
  --c-primary-dark:#223B38;
  --c-primary-soft:#E7EDEA;
  --c-primary-line:#C6D5CF;
  --c-accent:#C2703D;
  --c-accent-soft:#F7ECE3;
  --c-bg:#FAF9F6;
  --c-surface:#FFFFFF;
  --c-ink:#16191C;
  --c-ink-2:#3A4147;
  --c-muted:#6B7480;
  --c-line:#E3E1DC;
  --r-btn:6px;
  --r-card:12px;
  --r-img:12px;
  --r-chip:999px;
  --sh-1:0 1px 2px rgba(20,25,30,.04), 0 10px 28px -18px rgba(20,25,30,.18);
  --sh-2:0 2px 6px rgba(20,25,30,.06), 0 18px 40px -20px rgba(20,25,30,.24);
  --ease:cubic-bezier(.2,.7,.3,1);
  --maxw:1240px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease)}
a:hover{color:var(--c-primary)}
h1,h2,h3,h4{margin:0;font-weight:700;color:var(--c-ink);letter-spacing:-.01em}
p{margin:0}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--c-accent);outline-offset:2px;border-radius:4px}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding-left:24px;padding-right:24px}

/* ---------- header / nav ---------- */
.yk-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(250,249,246,.92);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--c-line);
  transition:transform .26s var(--ease),box-shadow .26s var(--ease),background-color .26s var(--ease);
}
.yk-header.is-stuck{background:rgba(255,255,255,.95);box-shadow:var(--sh-1)}
.yk-header.is-hidden{transform:translateY(-100%)}
.yk-nav-main{padding-top:8px}
.yk-nav-inner{display:flex;align-items:center;gap:20px;min-height:64px}
.yk-brand{display:inline-flex;align-items:center;gap:10px;white-space:nowrap;flex:0 0 auto}
.yk-logo-mark{
  width:34px;height:34px;border-radius:9px;background:var(--c-primary);color:#fff;
  display:grid;place-items:center;font-size:16px;font-weight:800;letter-spacing:0;
}
.yk-logo-text{font-size:19px;font-weight:700;letter-spacing:.01em;color:var(--c-ink)}
.yk-brand:hover .yk-logo-text{color:var(--c-primary)}
.yk-topnav{display:flex;align-items:center;gap:4px;margin-left:auto}
.yk-topnav a{
  position:relative;padding:9px 14px;border-radius:999px;font-size:14px;color:var(--c-ink-2);
}
.yk-topnav a:hover{background:var(--c-primary-soft);color:var(--c-primary)}
.yk-topnav a.is-active{color:var(--c-primary);font-weight:600}
.yk-topnav a.is-active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;border-radius:2px;background:var(--c-accent);
}
.yk-nav-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.yk-topnav + .yk-nav-actions{margin-left:0}
.yk-menu-btn{
  width:42px;height:42px;border:1px solid var(--c-line);background:#fff;border-radius:10px;
  display:inline-flex;align-items:center;justify-content:center;cursor:pointer;
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.yk-menu-btn:hover{border-color:var(--c-primary-line);background:var(--c-primary-soft)}
.yk-menu-btn span{display:block;width:18px;height:2px;background:var(--c-ink);border-radius:2px;position:relative}
.yk-menu-btn span::before,.yk-menu-btn span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--c-ink);border-radius:2px;
}
.yk-menu-btn span::before{top:-6px}
.yk-menu-btn span::after{top:6px}

.yk-chipbar{border-top:1px solid var(--c-line)}
.yk-chip-scroll{
  display:flex;align-items:center;gap:8px;padding:10px 24px;overflow-x:auto;
  scrollbar-width:none;-ms-overflow-style:none;
}
.yk-chip-scroll::-webkit-scrollbar{display:none}
.yk-chip{
  flex:0 0 auto;padding:7px 16px;border-radius:var(--r-chip);background:var(--c-primary-soft);
  color:var(--c-ink-2);font-size:14px;line-height:1.4;transition:background-color .2s var(--ease),color .2s var(--ease);
}
.yk-chip:hover{background:#DAE4E0;color:var(--c-primary)}
.yk-chip.is-active{background:var(--c-primary);color:#fff}

/* ---------- drawer ---------- */
.yk-overlay{
  position:fixed;inset:0;background:rgba(22,25,28,.42);z-index:1040;
  opacity:0;visibility:hidden;transition:opacity .24s var(--ease),visibility .24s var(--ease);
}
.yk-overlay.is-open{opacity:1;visibility:visible}
.yk-drawer{
  position:fixed;top:0;right:0;bottom:0;width:min(84vw,340px);background:#fff;z-index:1050;
  padding:22px;overflow-y:auto;border-left:1px solid var(--c-line);
  transform:translateX(102%);transition:transform .26s var(--ease);
}
.yk-drawer.is-open{transform:translateX(0)}
.yk-drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.yk-drawer-close{
  width:36px;height:36px;border-radius:9px;border:1px solid var(--c-line);background:#fff;
  font-size:20px;line-height:1;color:var(--c-ink-2);cursor:pointer;
}
.yk-drawer-close:hover{border-color:var(--c-primary-line);color:var(--c-primary)}
.yk-drawer-group{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:22px}
.yk-drawer-group .yk-chip{text-align:center;padding:10px 8px;font-size:13.5px}
.yk-drawer .yk-btn{width:100%}
.yk-drawer-note{margin-top:18px;font-size:13px;color:var(--c-muted);line-height:1.7}

/* ---------- buttons ---------- */
.yk-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:var(--r-btn);font-size:15px;font-weight:600;line-height:1.2;
  border:1px solid transparent;cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.yk-btn-primary{background:var(--c-primary);color:#fff}
.yk-btn-primary:hover{background:var(--c-primary-dark);color:#fff;transform:translateY(-2px);box-shadow:var(--sh-1)}
.yk-btn-primary:active{transform:translateY(0)}
.yk-btn-ghost{background:transparent;border-color:var(--c-primary);color:var(--c-primary)}
.yk-btn-ghost:hover{background:var(--c-primary-soft);color:var(--c-primary);transform:translateY(-2px)}
.yk-btn-ghost:active{transform:translateY(0)}
.yk-btn-sm{padding:8px 16px;font-size:14px}
.yk-link-more{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--c-primary);
  position:relative;
}
.yk-link-more::after{
  content:"";position:absolute;left:0;bottom:-3px;height:1px;width:0;background:var(--c-primary);
  transition:width .22s var(--ease);
}
.yk-link-more:hover::after{width:100%}

/* ---------- breadcrumb ---------- */
.yk-crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:26px 0 0;font-size:14px;color:var(--c-muted);
}
.yk-crumb a{color:var(--c-muted)}
.yk-crumb a:hover{color:var(--c-primary)}
.yk-crumb .sep{color:#C7C4BD}
.yk-crumb-current{
  max-width:min(62%,560px);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--c-ink-2);
}

/* ---------- article ---------- */
.yk-article-main{padding-bottom:8px}
.yk-article-head{padding:26px 0 26px;border-bottom:1px solid var(--c-line)}
.yk-article-title{
  font-size:clamp(26px,3.4vw,40px);line-height:1.24;font-weight:800;
  margin:0 0 16px;max-width:880px;
}
.yk-article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;font-size:14px;color:var(--c-muted)}
.yk-article-meta .dot{width:4px;height:4px;border-radius:50%;background:#C7C4BD;display:inline-block}
.yk-rule{width:48px;height:2px;border-radius:2px;background:var(--c-accent);margin:20px 0 0}
.yk-article-wrap{padding:44px 0 8px}
.yk-article-body{
  max-width:760px;margin:0 auto;font-size:17px;line-height:1.9;color:var(--c-ink-2);
  word-wrap:break-word;overflow-wrap:break-word;
}
.yk-article-body > *:first-child{margin-top:0}
.yk-article-body p{margin:0 0 1.15em}
.yk-article-body h2{
  position:relative;font-size:24px;line-height:1.4;color:var(--c-ink);
  margin:40px 0 16px;padding-left:14px;
}
.yk-article-body h2::before{
  content:"";position:absolute;left:0;top:.16em;bottom:.16em;width:4px;border-radius:3px;background:var(--c-primary);
}
.yk-article-body h3{font-size:19px;line-height:1.5;color:var(--c-ink);margin:28px 0 12px}
.yk-article-body h4{font-size:17px;color:var(--c-ink);margin:22px 0 10px}
.yk-article-body ul,.yk-article-body ol{margin:0 0 1.15em;padding-left:1.45em}
.yk-article-body li{margin:.42em 0}
.yk-article-body a{color:var(--c-primary);text-decoration:underline;text-underline-offset:3px}
.yk-article-body strong{color:var(--c-ink)}
.yk-article-body img{border-radius:10px;margin:24px auto;box-shadow:var(--sh-1)}
.yk-article-body figure{margin:24px 0}
.yk-article-body figcaption{font-size:13px;color:var(--c-muted);text-align:center;margin-top:8px;line-height:1.6}
.yk-article-body blockquote{
  margin:24px 0;padding:16px 20px;border-left:3px solid var(--c-accent);
  background:var(--c-primary-soft);border-radius:0 10px 10px 0;color:var(--c-ink-2);
}
.yk-article-body blockquote p:last-child{margin-bottom:0}
.yk-article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px}
.yk-article-body th,.yk-article-body td{border:1px solid var(--c-line);padding:10px 14px;text-align:left;vertical-align:top}
.yk-article-body th{background:#F3F1EC;color:var(--c-ink);font-weight:600}
.yk-article-body hr{border:0;border-top:1px solid var(--c-line);margin:32px 0}
.yk-article-body code{background:#F1EFE9;border-radius:4px;padding:2px 6px;font-size:15px}

.yk-empty{
  max-width:760px;margin:0 auto;padding:64px 28px;text-align:center;
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-card);
}
.yk-empty h2{font-size:20px;margin-bottom:10px}
.yk-empty p{color:var(--c-muted);font-size:15px;margin-bottom:22px}

.yk-tags{max-width:760px;margin:44px auto 0;display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding-top:24px;border-top:1px solid var(--c-line)}
.yk-tags-label{font-size:13px;color:var(--c-muted);letter-spacing:.06em}
.yk-tag{
  padding:6px 14px;border-radius:var(--r-chip);background:var(--c-primary-soft);
  color:var(--c-primary);font-size:13px;letter-spacing:.04em;
}
.yk-tag:hover{background:#D6E2DD;color:var(--c-primary-dark)}

.yk-pager{max-width:760px;margin:32px auto 0;display:grid;grid-template-columns:1fr 1fr;gap:16px}
.yk-pager-item{
  display:block;padding:18px 20px;background:var(--c-surface);border:1px solid var(--c-line);
  border-radius:var(--r-card);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.yk-pager-item:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:var(--c-primary-line)}
.yk-pager-item span{display:block;font-size:13px;color:var(--c-muted);margin-bottom:6px}
.yk-pager-item strong{display:block;font-size:15px;font-weight:600;color:var(--c-ink-2);line-height:1.55}
.yk-pager-item:hover strong{color:var(--c-primary)}
.yk-pager-item.is-next{text-align:right}

/* ---------- note strip ---------- */
.yk-section{padding:72px 0}
.yk-section--tight{padding:56px 0}
.yk-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:32px}
.yk-section-head h2{font-size:clamp(22px,2.6vw,30px);line-height:1.3}
.yk-section-head p{font-size:15px;color:var(--c-muted);margin-top:8px}
.yk-note{
  display:grid;grid-template-columns:repeat(3,1fr);gap:0;
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-card);overflow:hidden;
}
.yk-note-item{padding:26px 28px;border-right:1px solid var(--c-line)}
.yk-note-item:last-child{border-right:0}
.yk-note-num{
  font-family:Inter,"SFMono-Regular",Menlo,Consolas,monospace;
  font-size:13px;letter-spacing:.08em;color:var(--c-accent);display:block;margin-bottom:10px;
}
.yk-note-item h3{font-size:16px;margin-bottom:8px}
.yk-note-item p{font-size:14px;color:var(--c-muted);line-height:1.75}

/* ---------- cards ---------- */
.yk-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.yk-card{
  display:flex;flex-direction:column;background:var(--c-surface);border:1px solid var(--c-line);
  border-radius:var(--r-card);overflow:hidden;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.yk-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:var(--c-primary-line)}
.yk-card-media{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--c-primary-soft)}
.yk-card-media img{width:100%;height:100%;object-fit:cover;transition:transform .26s var(--ease)}
.yk-card:hover .yk-card-media img{transform:scale(1.03)}
.yk-card-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.yk-card-title{font-size:17px;line-height:1.5;font-weight:600;color:var(--c-ink);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.yk-card:hover .yk-card-title{color:var(--c-primary)}
.yk-card-text{font-size:14px;color:var(--c-muted);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.yk-card-meta{
  margin-top:auto;padding-top:12px;border-top:1px solid var(--c-line);
  display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--c-muted);
}
.yk-badge{
  display:inline-flex;align-items:center;padding:4px 11px;border-radius:var(--r-chip);
  background:var(--c-accent-soft);color:#9C5527;font-size:12px;letter-spacing:.04em;
}
.yk-backrow{max-width:760px;margin:40px auto 0;text-align:center}

/* ---------- footer ---------- */
.yk-footer{margin-top:24px;padding:64px 0 28px;border-top:1px solid var(--c-line);background:#F5F4EF}
.yk-footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:40px}
.yk-footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.yk-footer p{font-size:14px;color:var(--c-muted);line-height:1.8}
.yk-footer h4{font-size:15px;margin-bottom:16px;color:var(--c-ink)}
.yk-footer-links{display:flex;flex-direction:column;gap:10px}
.yk-footer-links a{position:relative;font-size:14px;color:var(--c-muted);width:fit-content}
.yk-footer-links a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1px;width:0;background:var(--c-primary);
  transition:width .22s var(--ease);
}
.yk-footer-links a:hover{color:var(--c-primary)}
.yk-footer-links a:hover::after{width:100%}
.yk-footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid var(--c-line);
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  font-size:13px;color:var(--c-muted);
}

/* ---------- motion ---------- */
.yk-reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.yk-reveal.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
  html{scroll-behavior:auto}
  .yk-reveal{opacity:1;transform:none}
  .yk-card:hover,.yk-pager-item:hover,.yk-btn:hover{transform:none}
}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .yk-nav-inner{min-height:60px}
  .yk-footer-grid{grid-template-columns:1.6fr 1fr 1fr;gap:32px}
}
@media (max-width:992px){
  .container{padding-left:20px;padding-right:20px}
  .yk-chip-scroll{padding-left:20px;padding-right:20px}
  .yk-section{padding:56px 0}
  .yk-section--tight{padding:44px 0}
  .yk-grid-3{grid-template-columns:repeat(2,1fr);gap:20px}
  .yk-note{grid-template-columns:1fr}
  .yk-note-item{border-right:0;border-bottom:1px solid var(--c-line)}
  .yk-note-item:last-child{border-bottom:0}
  .yk-footer{padding:48px 0 24px}
  .yk-footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .yk-crumb-current{max-width:100%}
}
@media (max-width:768px){
  body{font-size:15.5px}
  .yk-section{padding:48px 0}
  .yk-article-title{font-size:clamp(23px,5.6vw,30px)}
  .yk-article-body{font-size:16.5px;line-height:1.85}
  .yk-article-body h2{font-size:21px;margin-top:32px}
  .yk-article-body h3{font-size:17.5px}
  .yk-pager{grid-template-columns:1fr;gap:12px}
  .yk-pager-item.is-next{text-align:left}
  .yk-section-head{flex-direction:column;align-items:flex-start;gap:12px}
  .yk-footer-bottom{flex-direction:column}
}
@media (max-width:576px){
  .yk-grid-3{grid-template-columns:1fr}
  .yk-article-head{padding:20px 0 22px}
  .yk-article-wrap{padding:32px 0 8px}
  .yk-empty{padding:44px 20px}
  .yk-footer-grid{grid-template-columns:1fr}
  .yk-brand .yk-logo-text{font-size:17px}
}

/* roulang page: category1 */
:root{
  --c-primary:#2C4A46;
  --c-primary-deep:#223A37;
  --c-primary-soft:#E7EDEA;
  --c-primary-line:#D8E2DD;
  --c-accent:#C2703D;
  --c-accent-soft:#F6EAE1;
  --c-bg:#FAF9F6;
  --c-surface:#FFFFFF;
  --c-ink:#16191C;
  --c-ink-2:#3A4147;
  --c-muted:#6B7480;
  --c-line:#E3E1DC;
  --r-btn:6px;
  --r-card:12px;
  --r-chip:999px;
  --r-img:12px;
  --sh-1:0 1px 2px rgba(20,25,30,.04),0 10px 28px -18px rgba(20,25,30,.18);
  --sh-2:0 2px 6px rgba(20,25,30,.06),0 18px 38px -20px rgba(20,25,30,.24);
  --ease:cubic-bezier(.2,.7,.3,1);
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",Roboto,Helvetica,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--c-bg);color:var(--c-ink-2);
  font-family:var(--font-sans);font-size:16px;line-height:1.75;
  font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--c-primary);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--c-accent)}
h1,h2,h3,h4,h5{color:var(--c-ink);font-weight:800;letter-spacing:-.01em;margin:0;line-height:1.25}
p{margin:0 0 1.15em}
ul,ol{margin:0 0 1.15em;padding-left:1.2em}
li{margin-bottom:.4em}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--c-accent);outline-offset:2px}
::selection{background:var(--c-primary-soft);color:var(--c-primary-deep)}

/* ---------- 容器 ---------- */
.container{width:100%;max-width:1240px;padding-left:24px;padding-right:24px;margin:0 auto}
@media (min-width:1200px){.container{max-width:1240px}}
@media (min-width:1400px){.container{max-width:1240px}}
@media (max-width:575px){.container{padding-left:18px;padding-right:18px}}

/* ---------- 顶部导航 ---------- */
.yk-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(250,249,246,.94);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--c-line);
  transition:box-shadow .22s var(--ease),transform .26s var(--ease),background .22s var(--ease);
}
.yk-header.is-scrolled{background:rgba(250,249,246,.99);box-shadow:0 8px 26px -22px rgba(20,25,30,.5)}
.yk-header.is-hidden{transform:translateY(-100%)}
.yk-headbar{display:flex;align-items:center;gap:24px;height:68px}
.yk-brand{display:inline-flex;align-items:center;gap:10px;color:var(--c-ink);flex:0 0 auto}
.yk-brand:hover{color:var(--c-ink)}
.yk-logo-mark{
  width:32px;height:32px;border-radius:9px;background:var(--c-primary);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;
  font-size:16px;font-weight:800;letter-spacing:0;
}
.yk-logo-text{font-size:19px;font-weight:700;letter-spacing:.01em;white-space:nowrap}
.yk-topnav{margin-left:auto;display:flex;align-items:center;gap:26px}
.yk-topnav a{position:relative;padding:6px 0;font-size:15px;color:var(--c-ink-2)}
.yk-topnav a::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0;
  background:var(--c-accent);transition:width .22s var(--ease);
}
.yk-topnav a:hover{color:var(--c-ink)}
.yk-topnav a:hover::after{width:100%}
.yk-topnav a.is-active{color:var(--c-ink);font-weight:600}
.yk-topnav a.is-active::after{width:100%;background:var(--c-primary)}
.yk-head-actions{margin-left:24px;display:flex;align-items:center;gap:12px;flex:0 0 auto}
.yk-burger{
  width:40px;height:40px;border-radius:8px;border:1px solid var(--c-line);
  background:var(--c-surface);color:var(--c-ink);display:inline-flex;
  align-items:center;justify-content:center;font-size:16px;cursor:pointer;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.yk-burger:hover{border-color:var(--c-primary);background:var(--c-primary-soft)}

.yk-chipbar{border-top:1px solid var(--c-line);background:rgba(255,255,255,.55)}
.yk-chips{
  display:flex;align-items:center;gap:10px;padding:10px 0;
  overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;
}
.yk-chips::-webkit-scrollbar{display:none}
.yk-chip{
  flex:0 0 auto;display:inline-flex;align-items:center;gap:7px;
  height:34px;padding:0 16px;border-radius:var(--r-chip);
  background:var(--c-primary-soft);color:var(--c-ink-2);
  font-size:14px;line-height:1;white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
}
.yk-chip:hover{background:#DAE5E0;color:var(--c-ink)}
.yk-chip.is-active{background:var(--c-primary);color:#fff}
.yk-chip.is-active:hover{background:var(--c-primary-deep);color:#fff}
.yk-chip-static{background:var(--c-accent-soft);color:#8C4E24}

/* ---------- 按钮 ---------- */
.yk-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;line-height:1;border:1px solid transparent;
  cursor:pointer;text-decoration:none;white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.yk-btn-primary{background:var(--c-primary);color:#fff}
.yk-btn-primary:hover{background:#243D3A;color:#fff;transform:translateY(-2px);box-shadow:var(--sh-1)}
.yk-btn-primary:active{transform:translateY(0);box-shadow:none}
.yk-btn-ghost{background:transparent;border-color:var(--c-primary);color:var(--c-primary)}
.yk-btn-ghost:hover{background:var(--c-primary-soft);color:var(--c-primary-deep);transform:translateY(-2px)}
.yk-btn-ghost:active{transform:translateY(0)}
.yk-btn-soft{background:var(--c-primary-soft);color:var(--c-primary)}
.yk-btn-soft:hover{background:#DAE5E0;color:var(--c-primary-deep);transform:translateY(-2px)}
.yk-btn-sm{height:38px;padding:0 16px;font-size:14px}
.yk-btn-block{width:100%}
.yk-link{
  position:relative;display:inline-flex;align-items:center;gap:6px;
  font-size:15px;font-weight:600;color:var(--c-primary);
}
.yk-link::after{
  content:"";position:absolute;left:0;bottom:-3px;height:1px;width:0;
  background:var(--c-accent);transition:width .24s var(--ease);
}
.yk-link:hover::after{width:100%}

/* ---------- Hero ---------- */
.yk-hero{position:relative;padding:64px 0 44px;overflow:hidden}
.yk-hero-bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:.18;filter:saturate(.65);
}
.yk-hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(250,249,246,.72),rgba(250,249,246,.97));
}
.yk-hero .container{position:relative;z-index:2}
.yk-crumb{font-size:14px;color:var(--c-muted);margin-bottom:20px}
.yk-crumb a{color:var(--c-muted)}
.yk-crumb a:hover{color:var(--c-primary)}
.yk-crumb span.sep{margin:0 8px;color:#C4C1BA}
.yk-hero h1{
  font-size:clamp(34px,5vw,56px);line-height:1.15;letter-spacing:-.01em;
  margin:18px 0 18px;max-width:820px;
}
.yk-hero h1 em{font-style:normal;color:var(--c-primary);position:relative}
.yk-hero h1 em::after{
  content:"";position:absolute;left:0;right:0;bottom:.06em;height:8px;
  background:var(--c-accent-soft);border-radius:4px;z-index:-1;
}
.yk-hero-sub{font-size:clamp(16px,1.6vw,19px);color:var(--c-ink-2);max-width:640px;margin-bottom:8px}
.yk-hero-lead{font-size:16px;color:var(--c-muted);max-width:660px;margin-bottom:30px}
.yk-hero-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin-bottom:34px}
.yk-hero-metrics{
  display:flex;flex-wrap:wrap;gap:14px 36px;
  border-top:1px solid var(--c-line);padding-top:18px;
}
.yk-hero-metrics span{
  font-size:14px;color:var(--c-muted);display:inline-flex;align-items:center;gap:8px;
}
.yk-hero-metrics span i{color:var(--c-accent);font-size:12px}

/* ---------- 板块 ---------- */
.yk-section{padding:76px 0}
.yk-section-tight{padding:56px 0}
.yk-section-line{border-top:1px solid var(--c-line)}
.yk-eyebrow{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:.16em;
  color:var(--c-accent);text-transform:uppercase;margin-bottom:10px;
}
.yk-h2{font-size:clamp(26px,3.4vw,38px);line-height:1.2;letter-spacing:-.01em}
.yk-sec-head{max-width:760px;margin-bottom:40px}
.yk-sec-head p{margin-top:14px;color:var(--c-muted);font-size:16px}
.yk-sec-head-inline{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:24px;flex-wrap:wrap;margin-bottom:36px;
}

/* ---------- 文档区 ---------- */
.yk-doc-grid{display:grid;grid-template-columns:240px minmax(0,1fr);gap:56px;align-items:start}
.yk-toc-inner{position:sticky;top:132px}
.yk-toc-title{
  font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--c-muted);
  margin:0 0 14px;text-transform:uppercase;
}
.yk-toc-nav{border-left:1px solid var(--c-line);display:flex;flex-direction:column}
.yk-toc-nav a{
  position:relative;padding:8px 0 8px 16px;font-size:14px;color:var(--c-muted);
  transition:color .2s var(--ease);
}
.yk-toc-nav a::before{
  content:"";position:absolute;left:-1px;top:6px;bottom:6px;width:2px;
  background:transparent;transition:background .2s var(--ease);
}
.yk-toc-nav a:hover{color:var(--c-ink)}
.yk-toc-nav a.is-active{color:var(--c-primary);font-weight:600}
.yk-toc-nav a.is-active::before{background:var(--c-accent)}
.yk-toc-cta{margin-top:24px}

.yk-doc-body{max-width:820px;min-width:0}
.yk-doc-body section{scroll-margin-top:132px}
.yk-doc-body h2{
  position:relative;font-size:clamp(22px,2.4vw,28px);
  margin:52px 0 16px;padding-left:16px;
}
.yk-doc-body h2::before{
  content:"";position:absolute;left:0;top:.22em;bottom:.22em;width:4px;
  border-radius:2px;background:var(--c-accent);
}
.yk-doc-body section:first-of-type h2{margin-top:0}
.yk-doc-body p{font-size:17px;line-height:1.9;margin:0 0 1.15em;color:var(--c-ink-2)}
.yk-doc-body strong{color:var(--c-ink);font-weight:700}
.yk-doc-list{list-style:none;padding:0;margin:0 0 1.4em}
.yk-doc-list li{position:relative;padding-left:26px;margin-bottom:12px;line-height:1.85;font-size:16px}
.yk-doc-list li::before{
  content:"";position:absolute;left:6px;top:.72em;width:6px;height:6px;
  border-radius:50%;background:var(--c-primary);
}
.yk-note{
  background:var(--c-primary-soft);border-left:3px solid var(--c-primary);
  border-radius:0 10px 10px 0;padding:18px 22px;margin:0 0 1.5em;
  font-size:15.5px;line-height:1.85;color:var(--c-ink-2);
}
.yk-note strong{display:block;margin-bottom:6px;color:var(--c-primary-deep)}
.yk-quote{
  border-left:3px solid var(--c-accent);background:#fff;
  border-radius:0 10px 10px 0;padding:18px 22px;margin:0 0 1.5em;
  color:var(--c-ink);font-size:16px;line-height:1.85;
}
.yk-figure{margin:0 0 1.6em}
.yk-figure img{width:100%;border-radius:var(--r-img);box-shadow:var(--sh-1)}
.yk-figure figcaption{font-size:13px;color:var(--c-muted);margin-top:10px}

.yk-doc-table{width:100%;border-collapse:collapse;margin:0 0 1.6em;font-size:15px}
.yk-doc-table th,.yk-doc-table td{
  border:1px solid var(--c-line);padding:12px 14px;text-align:left;vertical-align:top;
}
.yk-doc-table th{background:var(--c-primary-soft);color:var(--c-ink);font-weight:700}

/* ---------- 流程步骤 ---------- */
.yk-steps{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  border-top:1px solid var(--c-line);border-left:1px solid var(--c-line);
  border-radius:var(--r-card);overflow:hidden;background:var(--c-surface);
}
.yk-step{
  position:relative;padding:28px 24px 26px;
  border-right:1px solid var(--c-line);border-bottom:1px solid var(--c-line);
  transition:background .22s var(--ease);
}
.yk-step:hover{background:var(--c-primary-soft)}
.yk-step-num{
  font-size:30px;font-weight:800;line-height:1;color:#CBD8D2;
  margin-bottom:14px;transition:color .22s var(--ease);
}
.yk-step:hover .yk-step-num{color:var(--c-accent)}
.yk-step h3{font-size:18px;margin-bottom:10px}
.yk-step p{font-size:14.5px;line-height:1.8;color:var(--c-muted);margin:0}

/* ---------- 序号行列表 ---------- */
.yk-rows{border-top:1px solid var(--c-line)}
.yk-row{
  display:grid;grid-template-columns:88px minmax(0,1fr) minmax(0,1.5fr);
  gap:28px;align-items:start;padding:28px 10px;
  border-bottom:1px solid var(--c-line);
  transition:background .22s var(--ease);
}
.yk-row:hover{background:var(--c-primary-soft)}
.yk-row-num{
  font-size:34px;font-weight:800;line-height:1;color:#CBD8D2;
  transition:color .22s var(--ease);
}
.yk-row:hover .yk-row-num{color:var(--c-accent)}
.yk-row h3{font-size:19px;margin-bottom:6px}
.yk-row p{margin:0;font-size:15px;line-height:1.85;color:var(--c-ink-2)}

/* ---------- 数据条 ---------- */
.yk-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
.yk-stat{padding:6px 28px;border-right:1px solid var(--c-line)}
.yk-stat:first-child{padding-left:0}
.yk-stat:last-child{border-right:0}
.yk-stat b{
  display:block;font-size:clamp(28px,4vw,44px);font-weight:800;color:var(--c-primary);
  line-height:1.05;letter-spacing:-.02em;
}
.yk-stat span{display:block;font-size:14px;color:var(--c-muted);margin-top:8px}

/* ---------- FAQ ---------- */
.yk-faq{border-top:1px solid var(--c-line)}
.yk-accordion .accordion-item{
  border:0;border-bottom:1px solid var(--c-line);background:transparent;border-radius:0;
}
.yk-accordion .accordion-button{
  background:transparent;box-shadow:none;border-radius:0;
  padding:22px 0;font-size:17.5px;font-weight:700;color:var(--c-ink);
  display:flex;align-items:center;gap:18px;line-height:1.5;
}
.yk-accordion .accordion-button:not(.collapsed){color:var(--c-primary);background:transparent}
.yk-accordion .accordion-button:focus{box-shadow:none}
.yk-accordion .accordion-button::after{display:none}
.yk-faq-q{flex:1 1 auto}
.yk-faq-icon{
  position:relative;width:18px;height:18px;flex:0 0 18px;margin-left:auto;
}
.yk-faq-icon::before,.yk-faq-icon::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--c-primary);
  border-radius:2px;transition:transform .24s var(--ease),background .24s var(--ease);
}
.yk-faq-icon::before{width:14px;height:2px;transform:translate(-50%,-50%)}
.yk-faq-icon::after{width:2px;height:14px;transform:translate(-50%,-50%)}
.yk-accordion .accordion-button:not(.collapsed) .yk-faq-icon::after{transform:translate(-50%,-50%) scaleY(0)}
.yk-accordion .accordion-button:not(.collapsed) .yk-faq-icon::before{background:var(--c-accent)}
.yk-accordion .accordion-body{
  padding:0 0 24px;font-size:16px;line-height:1.9;color:var(--c-ink-2);
  background:transparent;max-width:860px;
}

/* ---------- CTA 条 ---------- */
.yk-cta{
  background:var(--c-primary-soft);border:1px solid var(--c-primary-line);
  border-radius:16px;padding:34px 36px;
  display:flex;align-items:center;justify-content:space-between;
  gap:28px;flex-wrap:wrap;
}
.yk-cta h2{font-size:clamp(21px,2.4vw,27px);margin-bottom:8px}
.yk-cta p{margin:0;color:var(--c-ink-2);font-size:15.5px;max-width:560px}
.yk-cta-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.yk-footer{
  border-top:1px solid var(--c-line);background:var(--c-primary-soft);
  margin-top:96px;padding:60px 0 24px;
}
.yk-footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px}
.yk-footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.yk-footer h4{font-size:15px;margin:0 0 16px;color:var(--c-ink)}
.yk-footer p{font-size:14px;line-height:1.85;color:var(--c-muted);margin:0 0 10px}
.yk-footer-links{display:flex;flex-direction:column;gap:11px}
.yk-footer-links a{
  position:relative;width:fit-content;font-size:14px;color:var(--c-ink-2);
  transition:color .2s var(--ease);
}
.yk-footer-links a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1px;width:0;
  background:var(--c-accent);transition:width .24s var(--ease);
}
.yk-footer-links a:hover{color:var(--c-primary)}
.yk-footer-links a:hover::after{width:100%}
.yk-footer-bottom{
  border-top:1px solid var(--c-primary-line);margin-top:44px;padding-top:18px;
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  font-size:13px;color:var(--c-muted);
}

/* ---------- 抽屉 ---------- */
.yk-drawer{background:var(--c-bg);max-width:88vw}
.yk-drawer .offcanvas-header{border-bottom:1px solid var(--c-line);padding:18px 20px}
.yk-drawer .offcanvas-body{padding:20px}
.yk-drawer .yk-chip{
  width:100%;justify-content:flex-start;height:44px;margin-bottom:10px;
  font-size:15px;border-radius:10px;
}
.yk-drawer .offcanvas-title{font-size:17px;font-weight:700;color:var(--c-ink)}

/* ---------- 入场动效 ---------- */
.yk-reveal{opacity:0;transform:translateY(12px);transition:opacity .26s var(--ease),transform .26s var(--ease)}
.yk-reveal.is-in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .yk-head-actions{margin-left:auto}
  .yk-doc-grid{grid-template-columns:1fr;gap:28px}
  .yk-toc-inner{position:static}
  .yk-toc-nav{flex-direction:row;flex-wrap:wrap;gap:8px;border-left:0}
  .yk-toc-nav a{
    padding:7px 14px;border-radius:var(--r-chip);background:var(--c-primary-soft);
    font-size:13.5px;
  }
  .yk-toc-nav a::before{display:none}
  .yk-toc-cta{display:none}
  .yk-footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:32px}
}
@media (max-width:991px){
  .yk-section{padding:56px 0}
  .yk-hero{padding:48px 0 32px}
  .yk-steps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .yk-stats{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 0}
  .yk-stat{padding:0 20px}
  .yk-stat:nth-child(2){border-right:0}
  .yk-stat:nth-child(3){padding-left:0}
  .yk-row{grid-template-columns:64px minmax(0,1fr);gap:18px}
  .yk-row p{grid-column:1 / -1;margin-top:8px}
  .yk-footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  .yk-section{padding:48px 0}
  .yk-hero h1{font-size:clamp(28px,7vw,38px)}
  .yk-hero-sub{font-size:16px}
  .yk-doc-body p,.yk-doc-body li{font-size:16px}
  .yk-steps{grid-template-columns:1fr}
  .yk-cta{padding:26px 22px;border-radius:14px}
  .yk-footer{margin-top:64px;padding-top:44px}
  .yk-footer-grid{grid-template-columns:1fr;gap:28px}
  .yk-accordion .accordion-button{font-size:16.5px;padding:18px 0}
}
@media (max-width:575px){
  .yk-headbar{height:62px;gap:12px}
  .yk-logo-text{font-size:17px}
  .yk-hero-actions{gap:14px}
  .yk-hero-actions .yk-btn{width:100%}
  .yk-hero-metrics{gap:10px 0;flex-direction:column}
  .yk-row{grid-template-columns:1fr;gap:8px;padding:22px 4px}
  .yk-row-num{font-size:26px}
  .yk-chips{gap:8px}
  .yk-chip{height:32px;padding:0 13px;font-size:13px}
  .yk-footer-bottom{flex-direction:column;gap:6px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
  html{scroll-behavior:auto}
  .yk-reveal{opacity:1;transform:none}
  .yk-btn:hover{transform:none}
  img:hover{transform:none!important}
}

/* roulang page: category2 */
:root{
  --c-primary:#2C4A46;
  --c-primary-dark:#223936;
  --c-primary-soft:#E7EDEA;
  --c-accent:#C2703D;
  --c-accent-soft:#F7EDE5;
  --c-bg:#FAF9F6;
  --c-surface:#FFFFFF;
  --c-ink:#16191C;
  --c-ink-2:#3A4147;
  --c-muted:#6B7480;
  --c-line:#E3E1DC;
  --r-btn:6px;
  --r-card:12px;
  --r-img:12px;
  --r-chip:999px;
  --sh-1:0 1px 2px rgba(20,25,30,.04),0 10px 28px -18px rgba(20,25,30,.18);
  --sh-2:0 2px 4px rgba(20,25,30,.05),0 18px 40px -22px rgba(20,25,30,.26);
  --ease:cubic-bezier(.2,.7,.3,1);
  --max:1240px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.7;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--c-primary);text-decoration:none}
a:hover{color:var(--c-accent)}
button,input,textarea,select{font:inherit;color:inherit}
h1,h2,h3,h4,h5{margin:0;font-weight:700;line-height:1.22;letter-spacing:-.01em;color:var(--c-ink)}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--c-accent);outline-offset:2px}
.container{max-width:var(--max);padding-left:20px;padding-right:20px;margin:0 auto;width:100%}
.yk-num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.yk-section{padding:96px 0}
.yk-section-sm{padding:64px 0}
.yk-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.14em;font-weight:700;color:var(--c-primary);
  background:var(--c-primary-soft);border-radius:var(--r-chip);
  padding:6px 14px;margin-bottom:18px;
}
.yk-eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--c-accent)}
.yk-h1{font-size:clamp(34px,5vw,58px);line-height:1.15;letter-spacing:-.02em;font-weight:800}
.yk-h2{font-size:clamp(26px,3.4vw,38px);font-weight:800;letter-spacing:-.015em}
.yk-h3{font-size:21px;font-weight:700}
.yk-lead{color:var(--c-ink-2);font-size:17px;line-height:1.8;max-width:60ch}
.yk-muted{color:var(--c-muted);font-size:14px}
.yk-rule{width:48px;height:2px;background:var(--c-accent);border-radius:2px;margin:20px 0 24px}
.yk-section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:40px}
.yk-section-head p{color:var(--c-muted);font-size:15px;margin:12px 0 0;max-width:64ch}

/* buttons */
.yk-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;border:1px solid transparent;
  cursor:pointer;transition:background .2s var(--ease),color .2s var(--ease),transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
  text-align:center;line-height:1;
}
.yk-btn-primary{background:var(--c-primary);color:#fff;box-shadow:var(--sh-1)}
.yk-btn-primary:hover{background:var(--c-primary-dark);color:#fff;transform:translateY(-2px);box-shadow:var(--sh-2)}
.yk-btn-primary:active{transform:translateY(0)}
.yk-btn-ghost{background:transparent;color:var(--c-primary);border-color:var(--c-primary)}
.yk-btn-ghost:hover{background:var(--c-primary-soft);color:var(--c-primary);transform:translateY(-2px)}
.yk-btn-sm{height:40px;padding:0 18px;font-size:14px}
.yk-btn-block{width:100%}
.yk-textlink{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--c-primary);
  position:relative;padding-bottom:2px;
}
.yk-textlink::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--c-accent);
  transition:width .22s var(--ease);
}
.yk-textlink:hover::after{width:100%}

/* header */
.yk-header{
  position:sticky;top:0;z-index:1030;background:rgba(250,249,246,.92);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--c-line);
  transition:transform .26s var(--ease),box-shadow .26s var(--ease);
}
.yk-header.is-scrolled{box-shadow:0 8px 24px -20px rgba(20,25,30,.35);background:rgba(250,249,246,.98)}
.yk-header.is-hidden{transform:translateY(-102%)}
.yk-header-bar{display:flex;align-items:center;gap:20px;min-height:72px;padding:10px 0}
.yk-brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.yk-logo-mark{
  width:34px;height:34px;border-radius:9px;background:var(--c-primary);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;letter-spacing:0;
}
.yk-logo-text{font-size:19px;font-weight:700;letter-spacing:.01em;color:var(--c-ink)}
.yk-topnav{display:flex;align-items:center;gap:26px;margin-left:6px}
.yk-topnav a{
  font-size:14px;color:var(--c-ink-2);font-weight:500;position:relative;padding:4px 0;
}
.yk-topnav a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--c-accent);transition:width .22s var(--ease)}
.yk-topnav a:hover{color:var(--c-primary)}
.yk-topnav a:hover::after{width:100%}
.yk-topnav a.active{color:var(--c-primary);font-weight:700}
.yk-topnav a.active::after{width:100%}
.yk-header-actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.yk-burger{
  width:42px;height:42px;border-radius:10px;border:1px solid var(--c-line);background:#fff;
  display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;
}
.yk-burger span{display:block;width:18px;height:2px;background:var(--c-ink-2);border-radius:2px}
.yk-chipnav-wrap{border-top:1px solid var(--c-line);background:rgba(255,255,255,.6)}
.yk-chipnav{display:flex;gap:8px;overflow-x:auto;padding:10px 0;scrollbar-width:none}
.yk-chipnav::-webkit-scrollbar{display:none}
.yk-chip{
  flex:0 0 auto;display:inline-flex;align-items:center;height:36px;padding:0 16px;border-radius:var(--r-chip);
  background:#F1EFEA;color:var(--c-ink-2);font-size:14px;font-weight:500;
  transition:background .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
  border:1px solid transparent;white-space:nowrap;
}
.yk-chip:hover{background:var(--c-primary-soft);color:var(--c-primary)}
.yk-chip.active{background:var(--c-primary);color:#fff;font-weight:600}
.yk-drawer{background:var(--c-bg);width:320px}
.yk-drawer .offcanvas-header{border-bottom:1px solid var(--c-line);padding:18px 20px}
.yk-drawer .offcanvas-body{padding:20px}
.yk-drawer-group{margin-bottom:24px}
.yk-drawer-group h4{font-size:13px;letter-spacing:.1em;color:var(--c-muted);margin-bottom:12px;font-weight:700}
.yk-drawer-links{display:flex;flex-direction:column;gap:6px}
.yk-drawer-links a{padding:12px 14px;border-radius:10px;background:#fff;border:1px solid var(--c-line);font-size:15px;color:var(--c-ink-2);font-weight:500}
.yk-drawer-links a.active{background:var(--c-primary);color:#fff;border-color:var(--c-primary)}
.yk-drawer-links a:hover{border-color:var(--c-primary);color:var(--c-primary)}
.yk-drawer-links a.active:hover{color:#fff}

/* breadcrumb */
.yk-crumb{padding:20px 0 0;font-size:14px;color:var(--c-muted)}
.yk-crumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.yk-crumb li{display:flex;align-items:center;gap:8px}
.yk-crumb li+li::before{content:"/";color:var(--c-line)}
.yk-crumb a{color:var(--c-muted)}
.yk-crumb a:hover{color:var(--c-primary)}

/* hero */
.yk-hero{position:relative;overflow:hidden;padding:56px 0 72px}
.yk-hero-bg{
  position:absolute;inset:0;
  background:url(/assets/images/backpic/back-2.webp) center/cover no-repeat;
  opacity:.16;
}
.yk-hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(250,249,246,.96) 0%,rgba(250,249,246,.86) 52%,rgba(250,249,246,.62) 100%);
}
.yk-hero .container{position:relative;z-index:2}
.yk-hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.yk-hero-sub{font-size:18px;color:var(--c-ink-2);margin:18px 0 0;max-width:26ch}
.yk-hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.yk-hero-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:34px}
.yk-hero-media{position:relative}
.yk-hero-media img{
  width:100%;border-radius:var(--r-img);box-shadow:var(--sh-2);
  aspect-ratio:4/3;object-fit:cover;
}
.yk-hero-media::before{
  content:"";position:absolute;inset:-14px -14px auto auto;width:120px;height:120px;
  border-radius:16px;background:var(--c-accent-soft);z-index:-1;
}
.yk-hero-stats{
  margin-top:44px;padding-top:22px;border-top:1px solid var(--c-line);
  display:flex;flex-wrap:wrap;gap:28px;font-size:14px;color:var(--c-muted);
}
.yk-hero-stats strong{color:var(--c-ink);font-weight:700;font-variant-numeric:tabular-nums}

/* filter + cards */
.yk-filterbar{display:flex;flex-wrap:wrap;gap:10px;padding-bottom:28px;border-bottom:1px solid var(--c-line);margin-bottom:40px}
.yk-filter{
  height:40px;padding:0 18px;border-radius:var(--r-chip);border:1px solid var(--c-line);background:#fff;
  font-size:14px;font-weight:500;color:var(--c-ink-2);cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.yk-filter:hover{border-color:var(--c-primary);color:var(--c-primary)}
.yk-filter.active{background:var(--c-primary);border-color:var(--c-primary);color:#fff;font-weight:600}
.yk-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.yk-card{
  grid-column:span 7;
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-card);
  padding:30px;box-shadow:var(--sh-1);
  display:flex;flex-direction:column;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.yk-card.narrow{grid-column:span 5}
.yk-card.wide{grid-column:span 7}
.yk-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:var(--c-primary-soft)}
.yk-card-top{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.yk-card-icon{
  width:46px;height:46px;flex:0 0 46px;border-radius:12px;background:var(--c-primary-soft);
  color:var(--c-primary);display:flex;align-items:center;justify-content:center;
}
.yk-card-icon svg{width:22px;height:22px}
.yk-card-tag{
  font-size:12px;letter-spacing:.06em;font-weight:600;color:var(--c-accent);
  background:var(--c-accent-soft);border-radius:var(--r-chip);padding:4px 12px;
}
.yk-card h3{font-size:20px;margin-bottom:10px}
.yk-card-desc{color:var(--c-ink-2);font-size:15px;line-height:1.75;margin-bottom:18px}
.yk-points{display:flex;flex-direction:column;gap:10px;margin-bottom:22px}
.yk-points li{position:relative;padding-left:20px;font-size:14.5px;color:var(--c-ink-2);line-height:1.7}
.yk-points li::before{
  content:"";position:absolute;left:0;top:9px;width:7px;height:7px;border-radius:50%;
  background:var(--c-primary);opacity:.55;
}
.yk-card .yk-textlink{margin-top:auto}

/* steps */
.yk-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.yk-step{
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-card);
  padding:26px;box-shadow:var(--sh-1);position:relative;overflow:hidden;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease);
}
.yk-step:hover{transform:translateY(-2px);box-shadow:var(--sh-2)}
.yk-step-no{
  font-family:Georgia,"Songti SC",serif;font-size:40px;font-weight:400;color:var(--c-primary-soft);
  line-height:1;margin-bottom:12px;letter-spacing:-.03em;
}
.yk-step:hover .yk-step-no{color:var(--c-accent)}
.yk-step h3{font-size:17px;margin-bottom:10px}
.yk-step p{font-size:14.5px;color:var(--c-ink-2);margin:0}
.yk-step::after{
  content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:var(--c-primary);
  transform:scaleX(0);transform-origin:left;transition:transform .24s var(--ease);
}
.yk-step:hover::after{transform:scaleX(1)}

/* numbers */
.yk-numbers{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line)}
.yk-number{padding:36px 24px;border-right:1px solid var(--c-line)}
.yk-number:last-child{border-right:0}
.yk-number strong{
  display:block;font-size:clamp(28px,4vw,44px);font-weight:800;color:var(--c-primary);
  font-variant-numeric:tabular-nums;line-height:1.05;letter-spacing:-.02em;
}
.yk-number span{display:block;margin-top:10px;font-size:14px;color:var(--c-muted)}

/* info strip */
.yk-strip{
  background:var(--c-primary-soft);border-radius:var(--r-card);padding:26px 30px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px;
}
.yk-strip p{margin:0;color:var(--c-primary);font-size:15px;font-weight:600}
.yk-strip span{display:block;color:var(--c-ink-2);font-weight:400;font-size:14px;margin-top:4px}

/* media block */
.yk-split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.yk-split img{width:100%;border-radius:var(--r-img);box-shadow:var(--sh-1);aspect-ratio:16/11;object-fit:cover}
.yk-checklist{display:grid;gap:12px;margin-top:24px}
.yk-checklist li{display:flex;gap:12px;font-size:15px;color:var(--c-ink-2)}
.yk-checklist li::before{
  content:"";flex:0 0 auto;width:18px;height:18px;margin-top:4px;border-radius:50%;
  background:var(--c-primary-soft);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232C4A46' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size:11px;background-position:center;background-repeat:no-repeat;
}

/* faq */
.yk-accordion .accordion-item{
  border:0;border-bottom:1px solid var(--c-line);background:transparent;border-radius:0;
}
.yk-accordion .accordion-header{margin:0}
.yk-accordion .accordion-button{
  background:transparent;box-shadow:none;padding:22px 4px;font-size:17px;font-weight:600;color:var(--c-ink);
  border-radius:0;gap:16px;line-height:1.5;
}
.yk-accordion .accordion-button:not(.collapsed){color:var(--c-primary);background:transparent}
.yk-accordion .accordion-button::after{
  content:"+";background-image:none;transform:none;width:26px;height:26px;flex:0 0 26px;
  display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:400;
  color:var(--c-primary);line-height:1;
}
.yk-accordion .accordion-button:not(.collapsed)::after{content:"−";color:var(--c-accent)}
.yk-accordion .accordion-body{padding:0 4px 26px;font-size:15.5px;color:var(--c-ink-2);line-height:1.8;max-width:80ch}
.yk-accordion .accordion-collapse{border:0}
.yk-accordion .accordion-button:focus{box-shadow:none}
.yk-accordion .accordion-button:focus-visible{outline:2px solid var(--c-accent);outline-offset:2px}

/* form */
.yk-form-card{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-card);padding:32px;box-shadow:var(--sh-1)}
.yk-field{margin-bottom:20px}
.yk-field label{display:block;font-size:14px;font-weight:600;margin-bottom:8px;color:var(--c-ink-2)}
.yk-input{
  width:100%;height:48px;border:1px solid var(--c-line);border-radius:var(--r-btn);background:#fff;
  padding:0 14px;font-size:15px;color:var(--c-ink);transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
textarea.yk-input{height:auto;padding:12px 14px;resize:vertical;min-height:110px;line-height:1.7}
.yk-input::placeholder{color:#A6ACB4}
.yk-input:focus{
  outline:none;border-color:var(--c-primary);box-shadow:0 0 0 3px rgba(44,74,70,.10);
}
.yk-form-note{font-size:13px;color:var(--c-muted);margin-top:14px}

/* contact */
.yk-contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:32px;align-items:start}
.yk-info-card{background:var(--c-primary);color:#fff;border-radius:var(--r-card);padding:36px}
.yk-info-card h3{color:#fff;font-size:20px;margin-bottom:20px}
.yk-info-list{display:grid;gap:18px}
.yk-info-list div{border-top:1px solid rgba(255,255,255,.18);padding-top:14px}
.yk-info-list dt{font-size:13px;letter-spacing:.06em;color:rgba(255,255,255,.66);margin-bottom:4px}
.yk-info-list dd{margin:0;font-size:15.5px;line-height:1.7}
.yk-info-card p{color:rgba(255,255,255,.78);font-size:14px;margin:22px 0 0}

/* footer */
.yk-footer{border-top:1px solid var(--c-line);background:var(--c-primary-soft);padding:64px 0 0;margin-top:0}
.yk-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:48px}
.yk-footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.yk-footer-brand .yk-logo-mark{background:var(--c-primary);color:#fff}
.yk-footer-brand .yk-logo-text{font-size:17px;font-weight:700}
.yk-footer h4{font-size:14px;font-weight:700;letter-spacing:.06em;color:var(--c-ink);margin-bottom:16px}
.yk-footer p{font-size:14px;color:var(--c-ink-2);line-height:1.8;margin:0;max-width:38ch}
.yk-footer-links{display:flex;flex-direction:column;gap:10px}
.yk-footer-links a{font-size:14px;color:var(--c-ink-2);position:relative;width:fit-content;padding-bottom:1px}
.yk-footer-links a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--c-primary);transition:width .22s var(--ease)}
.yk-footer-links a:hover{color:var(--c-primary)}
.yk-footer-links a:hover::after{width:100%}
.yk-footer-bottom{
  border-top:1px solid rgba(44,74,70,.16);padding:20px 0 28px;display:flex;flex-wrap:wrap;
  justify-content:space-between;gap:12px;font-size:13px;color:var(--c-muted);
}

/* reveal */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* responsive */
@media (max-width:1199.98px){
  .yk-hero-inner{grid-template-columns:1fr;gap:40px}
  .yk-hero-media{order:-1;max-width:640px}
  .yk-hero-sub{max-width:none}
  .yk-steps{grid-template-columns:repeat(2,1fr)}
  .yk-footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:991.98px){
  .yk-section{padding:72px 0}
  .yk-card,.yk-card.wide,.yk-card.narrow{grid-column:span 12}
  .yk-numbers{grid-template-columns:repeat(2,1fr)}
  .yk-number:nth-child(2){border-right:0}
  .yk-number:nth-child(1),.yk-number:nth-child(2){border-bottom:1px solid var(--c-line)}
  .yk-split{grid-template-columns:1fr;gap:32px}
  .yk-contact-grid{grid-template-columns:1fr}
  .yk-h1{font-size:clamp(32px,6vw,44px)}
}
@media (max-width:767.98px){
  .yk-section{padding:48px 0}
  .yk-section-sm{padding:40px 0}
  .yk-hero{padding:36px 0 48px}
  .yk-hero-sub{font-size:16px}
  .yk-card{padding:24px}
  .yk-steps{grid-template-columns:1fr}
  .yk-hero-stats{gap:18px;font-size:13px}
  .yk-footer-grid{grid-template-columns:1fr;gap:28px}
  .yk-footer-bottom{flex-direction:column}
  .yk-form-card,.yk-info-card{padding:24px}
  .yk-strip{padding:22px}
  .yk-accordion .accordion-button{font-size:15.5px;padding:18px 4px}
}
@media (max-width:575.98px){
  .yk-numbers{grid-template-columns:1fr}
  .yk-number{border-right:0;border-bottom:1px solid var(--c-line);padding:26px 20px}
  .yk-number:last-child{border-bottom:0}
  .yk-h1{font-size:30px}
  .yk-btn{width:100%}
  .yk-hero-actions .yk-btn{width:100%}
  .yk-hero-chips{margin-top:24px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category3 */
:root{
  --c-primary:#2C4A46;
  --c-primary-soft:#E7EDEA;
  --c-primary-deep:#223A37;
  --c-accent:#C2703D;
  --c-bg:#FAF9F6;
  --c-surface:#FFFFFF;
  --c-ink:#16191C;
  --c-ink-2:#3A4147;
  --c-muted:#6B7480;
  --c-line:#E3E1DC;
  --r-btn:6px;
  --r-card:12px;
  --r-img:12px;
  --r-chip:999px;
  --sp-1:4px; --sp-2:8px; --sp-3:12px; --sp-4:16px; --sp-5:24px;
  --sp-6:32px; --sp-7:48px; --sp-8:64px; --sp-9:96px;
  --shadow-1:0 1px 2px rgba(20,25,30,.04), 0 10px 28px -18px rgba(20,25,30,.18);
  --shadow-2:0 2px 4px rgba(20,25,30,.05), 0 18px 40px -22px rgba(20,25,30,.24);
  --ease:cubic-bezier(.2,.7,.3,1);
  --t:220ms;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:var(--c-primary);text-decoration:none;transition:color var(--t) var(--ease),background-color var(--t) var(--ease),border-color var(--t) var(--ease);}
a:hover{color:var(--c-accent);}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.25;letter-spacing:-.01em;color:var(--c-ink);}
p{margin:0;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--c-accent);outline-offset:2px;border-radius:4px;}

.container{width:100%;max-width:1240px;margin-inline:auto;padding-inline:20px;}
.yk-num{font-variant-numeric:tabular-nums;}

/* ============ 按钮 ============ */
.btn{border-radius:var(--r-btn);font-weight:600;letter-spacing:.01em;transition:transform var(--t) var(--ease),background-color var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);}
.yk-btn-primary{
  --bs-btn-bg:var(--c-primary);
  --bs-btn-border-color:var(--c-primary);
  --bs-btn-color:#fff;
  --bs-btn-hover-bg:var(--c-primary-deep);
  --bs-btn-hover-border-color:var(--c-primary-deep);
  --bs-btn-hover-color:#fff;
  --bs-btn-active-bg:#1B2F2C;
  --bs-btn-active-border-color:#1B2F2C;
  --bs-btn-active-color:#fff;
  background-color:var(--bs-btn-bg);border:1px solid var(--bs-btn-border-color);color:var(--bs-btn-color);
  padding:12px 24px;font-size:15px;display:inline-flex;align-items:center;justify-content:center;gap:8px;
}
.yk-btn-primary:hover{background-color:var(--bs-btn-hover-bg);border-color:var(--bs-btn-hover-border-color);color:#fff;transform:translateY(-2px);}
.yk-btn-primary:active{transform:translateY(0);}
.yk-btn-ghost{
  --bs-btn-bg:transparent;
  --bs-btn-border-color:var(--c-primary);
  --bs-btn-color:var(--c-primary);
  --bs-btn-hover-bg:var(--c-primary-soft);
  --bs-btn-hover-border-color:var(--c-primary);
  --bs-btn-hover-color:var(--c-primary);
  --bs-btn-active-bg:#D8E2DE;
  --bs-btn-active-color:var(--c-primary);
  --bs-btn-active-border-color:var(--c-primary);
  background-color:transparent;border:1px solid var(--c-primary);color:var(--c-primary);
  padding:12px 24px;font-size:15px;display:inline-flex;align-items:center;justify-content:center;gap:8px;
}
.yk-btn-ghost:hover{background-color:var(--c-primary-soft);border-color:var(--c-primary);color:var(--c-primary);transform:translateY(-2px);}
.yk-btn-ghost:active{transform:translateY(0);}
.yk-btn-block{width:100%;}
.yk-link-more{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--c-primary);
  position:relative;
}
.yk-link-more::after{
  content:"";position:absolute;left:0;bottom:-3px;height:1px;width:0;background:var(--c-accent);
  transition:width var(--t) var(--ease);
}
.yk-link-more:hover{color:var(--c-accent);}
.yk-link-more:hover::after{width:100%;}
.yk-link-more i{font-size:12px;transition:transform var(--t) var(--ease);}
.yk-link-more:hover i{transform:translateX(3px);}

/* ============ 顶部导航 ============ */
.yk-header{
  position:sticky;top:0;z-index:1040;
  background:rgba(250,249,246,.94);
  backdrop-filter:blur(12px);
  border-bottom:1px solid transparent;
  transition:transform 240ms var(--ease),background-color 240ms var(--ease),border-color 240ms var(--ease),box-shadow 240ms var(--ease);
}
.yk-header.is-scrolled{background:#fff;border-bottom-color:var(--c-line);box-shadow:0 10px 30px -24px rgba(20,25,30,.5);}
.yk-header.is-hidden{transform:translateY(-102%);}
.yk-header-main{display:flex;align-items:center;gap:var(--sp-5);height:68px;}
.yk-brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;}
.yk-logo-mark{
  width:34px;height:34px;border-radius:9px;background:var(--c-primary);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;
  font-weight:800;font-size:17px;letter-spacing:0;flex-shrink:0;
}
.yk-logo-text{font-size:19px;font-weight:700;letter-spacing:.01em;color:var(--c-ink);white-space:nowrap;}
.yk-brand:hover .yk-logo-text{color:var(--c-primary);}
.yk-topnav{display:flex;align-items:center;gap:4px;margin-left:auto;}
.yk-topnav a{
  padding:8px 15px;border-radius:var(--r-chip);font-size:14.5px;color:var(--c-ink-2);white-space:nowrap;
}
.yk-topnav a:hover{background:var(--c-primary-soft);color:var(--c-primary);}
.yk-topnav a.is-active{background:var(--c-primary);color:#fff;}
.yk-header-actions{display:flex;align-items:center;gap:12px;margin-left:auto;}
.yk-topnav + .yk-header-actions{margin-left:16px;}
.yk-burger{
  width:42px;height:42px;border-radius:10px;border:1px solid var(--c-line);background:#fff;color:var(--c-ink);
  display:inline-flex;align-items:center;justify-content:center;font-size:17px;cursor:pointer;
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease);
}
.yk-burger:hover{border-color:var(--c-primary);color:var(--c-primary);}
.yk-chipsbar{padding-bottom:12px;}
.yk-chips{
  display:flex;gap:8px;overflow-x:auto;padding:2px 0 2px;scrollbar-width:none;-ms-overflow-style:none;
}
.yk-chips::-webkit-scrollbar{display:none;height:0;}
.yk-chip{
  flex:0 0 auto;padding:7px 16px;border-radius:var(--r-chip);background:var(--c-primary-soft);
  color:var(--c-ink-2);font-size:14px;white-space:nowrap;transition:background-color var(--t) var(--ease),color var(--t) var(--ease);
}
.yk-chip:hover{background:#DAE4E0;color:var(--c-primary);}
.yk-chip.is-active{background:var(--c-primary);color:#fff;}

.yk-drawer{
  position:fixed;inset:0;z-index:1080;background:rgba(22,25,28,.42);
  opacity:0;pointer-events:none;transition:opacity 220ms var(--ease);
}
.yk-drawer.is-open{opacity:1;pointer-events:auto;}
.yk-drawer-panel{
  position:absolute;top:0;right:0;height:100%;width:min(84vw,340px);background:#fff;padding:24px 22px;
  transform:translateX(100%);transition:transform 260ms var(--ease);overflow-y:auto;
  box-shadow:-20px 0 50px -30px rgba(20,25,30,.5);
}
.yk-drawer.is-open .yk-drawer-panel{transform:translateX(0);}
.yk-drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;}
.yk-drawer-head span{font-size:16px;font-weight:700;}
.yk-drawer-close{width:38px;height:38px;border-radius:10px;border:1px solid var(--c-line);background:#fff;font-size:16px;color:var(--c-ink);cursor:pointer;}
.yk-drawer-close:hover{border-color:var(--c-primary);color:var(--c-primary);}
.yk-drawer-links{display:flex;flex-direction:column;gap:6px;margin-bottom:20px;}
.yk-drawer-links a{padding:11px 14px;border-radius:10px;font-size:15px;color:var(--c-ink-2);background:#F4F3EF;}
.yk-drawer-links a:hover{background:var(--c-primary-soft);color:var(--c-primary);}
.yk-drawer-links a.is-current{background:var(--c-primary);color:#fff;}
.yk-drawer-note{font-size:13px;color:var(--c-muted);line-height:1.7;margin-bottom:18px;}

/* ============ Hero ============ */
.yk-hero{position:relative;padding:56px 0 44px;overflow:hidden;}
.yk-hero-bg{position:absolute;inset:0;background:url(/assets/images/backpic/back-2.webp) center/cover no-repeat;opacity:.42;pointer-events:none;}
.yk-hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(250,249,246,.74) 0%,rgba(250,249,246,.97) 78%,var(--c-bg) 100%);}
.yk-hero-inner{position:relative;display:grid;grid-template-columns:1.06fr .94fr;gap:var(--sp-7);align-items:center;}
.yk-eyebrow{
  display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:var(--r-chip);
  background:#fff;border:1px solid var(--c-line);font-size:13px;color:var(--c-ink-2);letter-spacing:.04em;margin-bottom:22px;
}
.yk-eyebrow i{color:var(--c-accent);font-size:12px;}
.yk-hero h1{font-size:clamp(34px,5vw,54px);line-height:1.14;letter-spacing:-.01em;margin-bottom:18px;}
.yk-hero h1 em{font-style:normal;color:var(--c-primary);}
.yk-hero-sub{font-size:clamp(16px,1.5vw,18px);color:var(--c-ink-2);max-width:560px;margin-bottom:14px;}
.yk-hero-desc{font-size:15px;color:var(--c-muted);max-width:600px;margin-bottom:28px;}
.yk-hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;}
.yk-hero-figure{position:relative;border-radius:var(--r-img);overflow:hidden;box-shadow:var(--shadow-2);background:#fff;}
.yk-hero-figure::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(250,249,246,.06),rgba(44,74,70,.16));}
.yk-hero-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.yk-hero-meta{
  position:relative;margin-top:40px;padding-top:18px;border-top:1px solid var(--c-line);
  display:flex;flex-wrap:wrap;gap:10px 34px;font-size:13.5px;color:var(--c-muted);
}
.yk-hero-meta span{display:inline-flex;align-items:center;gap:8px;}
.yk-hero-meta i{color:var(--c-primary);font-size:12px;}

/* ============ 通用板块 ============ */
.yk-section{padding:64px 0;}
.yk-section-tight{padding:36px 0 12px;}
.yk-section-head{margin-bottom:36px;max-width:760px;}
.yk-section-head h2{font-size:clamp(26px,3.4vw,36px);line-height:1.2;margin-bottom:12px;}
.yk-section-head p{color:var(--c-ink-2);font-size:15.5px;}
.yk-kicker{
  display:inline-block;font-size:12.5px;letter-spacing:.14em;color:var(--c-accent);font-weight:700;margin-bottom:12px;
}
.yk-h2-bar{position:relative;padding-left:16px;}
.yk-h2-bar::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:3px;background:var(--c-accent);border-radius:2px;}

/* ============ 分类锚点条 ============ */
.yk-anchorbar{
  display:flex;flex-wrap:wrap;gap:10px;padding:18px 0 0;
}
.yk-anchor{
  display:inline-flex;align-items:center;gap:8px;padding:9px 16px;border-radius:var(--r-chip);
  background:#fff;border:1px solid var(--c-line);font-size:14px;color:var(--c-ink-2);
}
.yk-anchor:hover{border-color:var(--c-primary);color:var(--c-primary);background:var(--c-primary-soft);}
.yk-anchor i{font-size:12px;color:var(--c-accent);}
.yk-anchor b{font-weight:700;font-variant-numeric:tabular-nums;}

/* ============ 问答两栏 ============ */
.yk-qa-layout{display:grid;grid-template-columns:minmax(0,1.9fr) minmax(0,1fr);gap:var(--sp-7);align-items:start;}
.yk-qa-group{padding-top:8px;margin-bottom:36px;}
.yk-qa-group-head{display:flex;align-items:baseline;gap:12px;margin-bottom:6px;}
.yk-qa-group-head h2{font-size:clamp(21px,2.2vw,25px);}
.yk-qa-group-head span{font-size:13px;color:var(--c-muted);letter-spacing:.04em;}
.yk-qa-list{border-top:1px solid var(--c-line);}
.yk-qa{
  display:grid;grid-template-columns:66px minmax(0,1fr);gap:18px;
  padding:26px 0;border-bottom:1px solid var(--c-line);
  transition:background-color var(--t) var(--ease);
}
.yk-qa:hover{background:linear-gradient(90deg,rgba(231,237,234,.55),rgba(231,237,234,0));}
.yk-qa-no{
  font-size:clamp(24px,2.6vw,30px);font-weight:800;line-height:1.1;color:#C4D2CD;
  font-variant-numeric:tabular-nums;transition:color var(--t) var(--ease);letter-spacing:-.02em;
}
.yk-qa:hover .yk-qa-no{color:var(--c-accent);}
.yk-qa h3{font-size:19px;line-height:1.45;margin-bottom:10px;}
.yk-qa p{font-size:15.5px;color:var(--c-ink-2);margin-bottom:8px;}
.yk-qa p:last-child{margin-bottom:0;}
.yk-qa-note{
  display:inline-flex;align-items:center;gap:8px;margin-top:12px;padding:6px 12px;border-radius:var(--r-chip);
  background:var(--c-primary-soft);color:var(--c-primary);font-size:13px;
}

/* ============ 侧边粘性卡 ============ */
.yk-qa-aside{position:sticky;top:104px;display:grid;gap:20px;}
.yk-card{
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-card);
  padding:26px 24px;box-shadow:var(--shadow-1);
}
.yk-card-accent{background:linear-gradient(180deg,#F3F7F5 0%,#FFFFFF 60%);}
.yk-card h3{font-size:18px;margin-bottom:10px;}
.yk-card p{font-size:14.5px;color:var(--c-ink-2);margin-bottom:16px;}
.yk-card-tag{
  display:inline-block;font-size:12px;letter-spacing:.1em;color:var(--c-accent);font-weight:700;margin-bottom:10px;
}
.yk-contact-list{display:grid;gap:0;margin:4px 0 18px;}
.yk-contact-list li{
  display:flex;align-items:flex-start;gap:12px;padding:13px 0;border-bottom:1px dashed var(--c-line);
  font-size:14.5px;color:var(--c-ink-2);
}
.yk-contact-list li:last-child{border-bottom:0;padding-bottom:4px;}
.yk-contact-list i{color:var(--c-primary);font-size:14px;margin-top:5px;width:16px;text-align:center;}
.yk-contact-list b{display:block;color:var(--c-ink);font-weight:600;font-size:14.5px;}
.yk-contact-list span{color:var(--c-muted);font-size:13px;}

/* ============ 表单 ============ */
.yk-field{margin-bottom:14px;}
.yk-field label{display:block;font-size:13.5px;font-weight:600;color:var(--c-ink-2);margin-bottom:7px;}
.yk-input{
  width:100%;height:46px;padding:0 14px;font-size:14.5px;color:var(--c-ink);
  background:#fff;border:1px solid var(--c-line);border-radius:var(--r-btn);
  transition:border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
textarea.yk-input{height:auto;padding:12px 14px;resize:vertical;min-height:96px;line-height:1.7;}
.yk-input::placeholder{color:#A6ADB5;}
.yk-input:focus{outline:none;border-color:var(--c-primary);box-shadow:0 0 0 3px rgba(44,74,70,.1);}
.yk-form-hint{font-size:13px;color:var(--c-muted);margin-top:12px;margin-bottom:0;}

/* ============ 提问准备步骤 ============ */
.yk-steps{
  display:grid;grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);background:#fff;
}
.yk-step{padding:30px 26px;border-right:1px solid var(--c-line);transition:background-color var(--t) var(--ease);}
.yk-step:last-child{border-right:0;}
.yk-step:hover{background:var(--c-primary-soft);}
.yk-step-no{
  font-size:32px;font-weight:800;color:#C4D2CD;line-height:1;margin-bottom:14px;font-variant-numeric:tabular-nums;
}
.yk-step:hover .yk-step-no{color:var(--c-accent);}
.yk-step h3{font-size:17.5px;margin-bottom:8px;}
.yk-step p{font-size:14.5px;color:var(--c-ink-2);}

/* ============ 其他栏目入口行 ============ */
.yk-entry-list{border-top:1px solid var(--c-line);}
.yk-entry{
  display:grid;grid-template-columns:200px minmax(0,1fr) auto;gap:24px;align-items:center;
  padding:22px 8px;border-bottom:1px solid var(--c-line);
  transition:background-color var(--t) var(--ease),padding-left var(--t) var(--ease);
}
.yk-entry:hover{background:var(--c-primary-soft);padding-left:16px;}
.yk-entry h3{font-size:17px;}
.yk-entry p{font-size:14.5px;color:var(--c-ink-2);}
.yk-entry i{color:var(--c-primary);font-size:15px;transition:transform var(--t) var(--ease);}
.yk-entry:hover i{transform:translateX(4px);color:var(--c-accent);}

/* ============ 更新说明条 ============ */
.yk-notice{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  background:var(--c-primary-soft);border:1px solid #D8E2DE;border-radius:var(--r-card);
  padding:24px 28px;
}
.yk-notice p{font-size:14.5px;color:var(--c-ink-2);max-width:760px;}
.yk-notice strong{color:var(--c-ink);font-weight:700;}
.yk-notice span{font-size:13px;color:var(--c-muted);font-variant-numeric:tabular-nums;}

/* ============ 页脚 ============ */
.yk-footer{background:#F4F3EF;border-top:1px solid var(--c-line);margin-top:24px;padding:56px 0 0;}
.yk-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:40px;}
.yk-footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.yk-footer p{font-size:14px;color:var(--c-ink-2);line-height:1.8;}
.yk-footer h4{font-size:15px;margin-bottom:16px;}
.yk-footer-links{display:flex;flex-direction:column;gap:10px;}
.yk-footer-links a{position:relative;font-size:14px;color:var(--c-ink-2);width:fit-content;}
.yk-footer-links a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:1px;background:var(--c-primary);transition:width var(--t) var(--ease);}
.yk-footer-links a:hover{color:var(--c-primary);}
.yk-footer-links a:hover::after{width:100%;}
.yk-footer-bottom{
  border-top:1px solid var(--c-line);padding:20px 0 26px;display:flex;flex-wrap:wrap;gap:10px 24px;
  justify-content:space-between;font-size:13px;color:var(--c-muted);
}

/* ============ 动效 ============ */
.yk-reveal{opacity:0;transform:translateY(12px);transition:opacity 420ms var(--ease),transform 420ms var(--ease);}
.yk-reveal.is-in{opacity:1;transform:none;}

/* ============ 响应式 ============ */
@media (max-width:1199.98px){
  .yk-topnav{display:none !important;}
  .yk-hero-inner{grid-template-columns:1fr;gap:32px;}
  .yk-hero-figure{max-width:640px;}
  .yk-footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:32px;}
}
@media (max-width:991.98px){
  .yk-section{padding:52px 0;}
  .yk-qa-layout{grid-template-columns:1fr;gap:32px;}
  .yk-qa-aside{position:static;}
  .yk-steps{grid-template-columns:1fr;}
  .yk-step{border-right:0;border-bottom:1px solid var(--c-line);padding:24px 20px;}
  .yk-step:last-child{border-bottom:0;}
  .yk-entry{grid-template-columns:1fr auto;gap:12px;}
  .yk-entry h3{grid-column:1;}
  .yk-entry p{grid-column:1;}
  .yk-footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
}
@media (max-width:767.98px){
  body{font-size:15.5px;}
  .yk-header-main{height:62px;gap:12px;}
  .yk-logo-text{font-size:17px;}
  .yk-hero{padding:36px 0 32px;}
  .yk-hero h1{font-size:clamp(28px,7.4vw,36px);}
  .yk-hero-meta{margin-top:28px;gap:8px 20px;font-size:13px;}
  .yk-section{padding:44px 0;}
  .yk-section-head{margin-bottom:26px;}
  .yk-qa{grid-template-columns:48px minmax(0,1fr);gap:12px;padding:22px 0;}
  .yk-qa h3{font-size:17px;}
  .yk-card{padding:22px 18px;}
  .yk-notice{padding:20px;flex-direction:column;align-items:flex-start;}
  .yk-footer{padding-top:44px;}
  .yk-footer-grid{grid-template-columns:1fr;gap:26px;padding-bottom:30px;}
  .yk-footer-bottom{flex-direction:column;gap:6px;}
}
@media (max-width:575.98px){
  .container{padding-inline:16px;}
  .yk-chips{gap:6px;}
  .yk-chip{padding:6px 13px;font-size:13px;}
  .yk-anchorbar{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;padding-bottom:4px;}
  .yk-anchorbar::-webkit-scrollbar{display:none;}
  .yk-hero-actions{flex-direction:column;align-items:stretch;}
  .yk-hero-actions .btn{width:100%;}
  .yk-entry{grid-template-columns:1fr;}
  .yk-entry i{display:none;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;}
  .yk-reveal{opacity:1;transform:none;}
}

/* roulang page: category4 */
*,*::before,*::after{box-sizing:border-box}
:root{
  --c-primary:#2C4A46;
  --c-primary-dark:#223A37;
  --c-primary-soft:#E7EDEA;
  --c-accent:#C2703D;
  --c-bg:#FAF9F6;
  --c-surface:#FFFFFF;
  --c-ink:#16191C;
  --c-ink-2:#3A4147;
  --c-muted:#6B7480;
  --c-line:#E3E1DC;
  --r-sm:6px;--r-md:12px;--r-pill:999px;
  --sh-1:0 1px 2px rgba(20,25,30,.04),0 10px 28px -18px rgba(20,25,30,.18);
  --sh-2:0 2px 4px rgba(20,25,30,.05),0 18px 40px -20px rgba(20,25,30,.24);
  --ease:cubic-bezier(.2,.7,.3,1);
  --sp:24px;
}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--c-bg);color:var(--c-ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;
  font-variant-numeric:tabular-nums;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .22s var(--ease)}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.2;letter-spacing:-.01em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--c-accent);outline-offset:2px}
.container{max-width:1240px;padding-inline:20px}
@media (min-width:1400px){.container{max-width:1240px}}

/* ---------- header ---------- */
.yk-header{
  position:sticky;top:0;z-index:1030;background:rgba(250,249,246,.94);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--c-line);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.yk-header.is-scrolled{box-shadow:var(--sh-1)}
.yk-header.is-hidden{transform:translateY(-100%)}
.yk-header-inner{display:flex;align-items:center;gap:28px;min-height:72px}
.yk-brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.yk-logo-mark{
  width:34px;height:34px;border-radius:9px;background:var(--c-primary);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;letter-spacing:.02em;
}
.yk-logo-text{font-size:19px;font-weight:700;letter-spacing:.01em;color:var(--c-ink);white-space:nowrap}
.yk-brand:hover .yk-logo-text{color:var(--c-primary)}
.yk-topnav{display:flex;align-items:center;gap:26px;margin-left:auto}
.yk-topnav a{font-size:15px;color:var(--c-ink-2);position:relative;padding:6px 0}
.yk-topnav a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--c-accent);transition:width .24s var(--ease)}
.yk-topnav a:hover{color:var(--c-primary)}
.yk-topnav a:hover::after{width:100%}
.yk-header-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.yk-topnav + .yk-header-actions{margin-left:0}
.yk-burger{
  width:42px;height:42px;border:1px solid var(--c-line);background:var(--c-surface);
  border-radius:var(--r-sm);color:var(--c-primary);display:inline-flex;align-items:center;justify-content:center;
}
.yk-burger:hover{background:var(--c-primary-soft)}
.yk-subnav{border-top:1px solid var(--c-line);background:rgba(255,255,255,.6)}
.yk-chiprow{display:flex;gap:10px;padding:12px 20px;overflow-x:auto;scrollbar-width:none}
.yk-chiprow::-webkit-scrollbar{display:none}
.yk-chip{
  display:inline-flex;align-items:center;gap:6px;flex:0 0 auto;
  padding:8px 18px;border-radius:var(--r-pill);font-size:14px;font-weight:600;
  background:var(--c-primary-soft);color:var(--c-ink-2);white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease);
}
.yk-chip:hover{background:#DAE4E0;color:var(--c-primary)}
.yk-chip.active{background:var(--c-primary);color:#fff}
.yk-mobile{padding:14px 20px 20px;border-top:1px solid var(--c-line);background:var(--c-bg)}
.yk-mobile a{display:block;padding:11px 0;font-size:15px;color:var(--c-ink-2);border-bottom:1px solid var(--c-line)}
.yk-mobile a:last-child{border-bottom:0}
.yk-mobile a:hover{color:var(--c-primary)}

/* ---------- buttons ---------- */
.yk-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--r-sm);border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;
  transition:background .22s var(--ease),color .22s var(--ease),transform .22s var(--ease),border-color .22s var(--ease);
}
.yk-btn-primary{background:var(--c-primary);border-color:var(--c-primary);color:#fff}
.yk-btn-primary:hover{background:var(--c-primary-dark);border-color:var(--c-primary-dark);color:#fff;transform:translateY(-2px)}
.yk-btn-primary:active{transform:translateY(0)}
.yk-btn-ghost{background:transparent;border-color:var(--c-primary);color:var(--c-primary)}
.yk-btn-ghost:hover{background:var(--c-primary-soft);transform:translateY(-2px)}
.yk-btn-sm{padding:9px 16px;font-size:14px}
.yk-btn-link{
  padding:4px 0;border:0;background:none;color:var(--c-primary);font-weight:600;position:relative;
}
.yk-btn-link::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--c-accent);transition:width .24s var(--ease)}
.yk-btn-link:hover::after{width:100%}

/* ---------- hero ---------- */
.yk-hero{position:relative;overflow:hidden;border-bottom:1px solid var(--c-line)}
.yk-hero-bg{
  position:absolute;inset:0;
  background-image:linear-gradient(100deg,rgba(250,249,246,.96) 0%,rgba(250,249,246,.88) 45%,rgba(250,249,246,.62) 100%),url('/assets/images/backpic/back-1.png');
  background-size:cover;background-position:center right;
}
.yk-hero-inner{position:relative;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:56px;align-items:center;padding:72px 20px 64px}
.yk-crumb{font-size:13.5px;color:var(--c-muted);margin-bottom:18px}
.yk-crumb a:hover{color:var(--c-primary)}
.yk-crumb span.sep{margin:0 8px;color:#C6C2B9}
.yk-eyebrow{
  display:inline-block;padding:5px 14px;border-radius:var(--r-pill);
  background:var(--c-primary-soft);color:var(--c-primary);font-size:12.5px;font-weight:700;letter-spacing:.06em;margin-bottom:18px;
}
.yk-hero h1{font-size:clamp(32px,4.6vw,54px);line-height:1.15;letter-spacing:-.01em;font-weight:800}
.yk-hero h1 em{font-style:normal;color:var(--c-primary)}
.yk-hero-sub{margin-top:16px;font-size:17px;color:var(--c-ink-2);max-width:520px}
.yk-hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:18px;margin-top:28px}
.yk-hero-meta{display:flex;flex-wrap:wrap;gap:12px 26px;margin-top:30px;padding-top:22px;border-top:1px solid var(--c-line);font-size:14px;color:var(--c-muted)}
.yk-hero-meta li{display:flex;align-items:center;gap:8px}
.yk-hero-meta i{color:var(--c-accent);font-size:12px}
.yk-hero-visual{border-radius:var(--r-md);overflow:hidden;box-shadow:var(--sh-2);background:var(--c-surface)}
.yk-hero-visual img{width:100%;aspect-ratio:4/3;object-fit:cover}

/* ---------- sections ---------- */
.yk-section{padding:96px 0}
.yk-section-tight{padding:64px 0}
.yk-section-alt{background:var(--c-surface);border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line)}
.yk-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px}
.yk-section-head h2{font-size:clamp(25px,3.2vw,36px);font-weight:800}
.yk-section-head p{margin-top:12px;color:var(--c-muted);font-size:15.5px;max-width:640px}
.yk-section-head .yk-head-link{flex:0 0 auto;font-size:14.5px}

/* ---------- stats ---------- */
.yk-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.yk-stat{padding:8px 26px;border-left:1px solid var(--c-line)}
.yk-stat:first-child{border-left:0;padding-left:0}
.yk-stat-num{font-size:clamp(26px,3.6vw,40px);font-weight:800;color:var(--c-primary);line-height:1.1;font-variant-numeric:tabular-nums}
.yk-stat-num small{font-size:14px;font-weight:600;color:var(--c-ink-2);margin-left:6px}
.yk-stat p{margin-top:8px;font-size:14px;color:var(--c-muted)}

/* ---------- steps list ---------- */
.yk-steps{border-top:1px solid var(--c-line)}
.yk-steps li{display:flex;gap:28px;padding:28px 8px;border-bottom:1px solid var(--c-line);transition:background .22s var(--ease)}
.yk-steps li:hover{background:var(--c-primary-soft)}
.yk-steps li:hover .yk-step-num{color:var(--c-accent)}
.yk-step-num{flex:0 0 72px;font-size:34px;font-weight:800;color:#CBD6D2;line-height:1.1;font-variant-numeric:tabular-nums;transition:color .22s var(--ease)}
.yk-steps h3{font-size:19px;margin-bottom:8px}
.yk-steps p{color:var(--c-ink-2);font-size:15.5px;max-width:760px}

/* ---------- timeline ---------- */
.yk-filter{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:24px}
.yk-filter button{
  padding:8px 16px;border-radius:var(--r-pill);border:1px solid var(--c-line);background:var(--c-surface);
  font-size:14px;font-weight:600;color:var(--c-ink-2);cursor:pointer;transition:all .2s var(--ease);
}
.yk-filter button:hover{border-color:var(--c-primary);color:var(--c-primary)}
.yk-filter button.is-active{background:var(--c-primary);border-color:var(--c-primary);color:#fff}
.yk-timeline{border-top:1px solid var(--c-line)}
.yk-tl-item{
  position:relative;display:grid;grid-template-columns:118px minmax(0,1fr);gap:0 28px;padding:26px 0;
  transition:background .22s var(--ease);border-radius:var(--r-md);
}
.yk-tl-item::before{content:"";position:absolute;left:132px;top:0;bottom:0;width:1px;background:var(--c-line)}
.yk-tl-item:last-child::after{content:"";position:absolute;left:132px;bottom:0;width:1px;height:50%;background:var(--c-bg)}
.yk-tl-dot{
  position:absolute;left:126px;top:36px;width:9px;height:9px;border-radius:50%;
  background:var(--c-bg);border:2px solid var(--c-primary);z-index:1;transition:all .22s var(--ease);
}
.yk-tl-item:hover{background:var(--c-primary-soft)}
.yk-tl-item:hover .yk-tl-dot{background:var(--c-accent);border-color:var(--c-accent)}
.yk-tl-date{font-size:14px;font-weight:600;color:var(--c-primary);padding-top:6px;font-variant-numeric:tabular-nums}
.yk-tl-date small{display:block;font-size:12.5px;color:var(--c-muted);font-weight:400;margin-top:4px}
.yk-tl-body{display:flex;gap:26px;flex-wrap:wrap;align-items:flex-start}
.yk-tl-text{flex:1 1 340px;min-width:0}
.yk-tl-text h3{font-size:19.5px;margin:10px 0 10px}
.yk-tl-text p{color:var(--c-ink-2);font-size:15.5px}
.yk-tag{
  display:inline-block;padding:4px 12px;border-radius:var(--r-pill);background:var(--c-surface);
  border:1px solid var(--c-line);color:var(--c-primary);font-size:12.5px;font-weight:600;letter-spacing:.04em;
}
.yk-tl-item:hover .yk-tag{background:var(--c-surface)}
.yk-tl-thumb{flex:0 0 250px;max-width:250px;border-radius:10px;overflow:hidden;aspect-ratio:16/9;background:var(--c-surface)}
.yk-tl-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .26s var(--ease)}
.yk-tl-thumb:hover img{transform:scale(1.03)}
.yk-tl-link{display:inline-flex;align-items:center;gap:6px;margin-top:14px;font-size:14.5px;font-weight:600;color:var(--c-primary)}
.yk-tl-link::after{content:"";position:absolute;left:0;bottom:-2px;height:2px;width:0;background:var(--c-accent);transition:width .24s var(--ease)}
.yk-tl-link{position:relative}
.yk-tl-link:hover::after{width:100%}

/* ---------- form / contact ---------- */
.yk-contact{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:28px;align-items:start}
.yk-panel{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-md);box-shadow:var(--sh-1);padding:32px}
.yk-panel h3{font-size:20px;margin-bottom:20px}
.yk-info-list li{display:flex;gap:14px;padding:15px 0;border-bottom:1px solid var(--c-line)}
.yk-info-list li:last-child{border-bottom:0;padding-bottom:0}
.yk-info-list i{color:var(--c-primary);font-size:15px;margin-top:4px}
.yk-info-list strong{display:block;font-size:15px;margin-bottom:3px}
.yk-info-list span{font-size:14px;color:var(--c-muted)}
.yk-form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.yk-field{margin-bottom:18px}
.yk-label{display:block;font-size:14px;font-weight:600;color:var(--c-ink-2);margin-bottom:8px}
.yk-input,.yk-select,.yk-textarea{
  width:100%;height:48px;padding:0 14px;border:1px solid var(--c-line);border-radius:var(--r-sm);
  background:var(--c-surface);transition:border-color .2s var(--ease);
}
.yk-textarea{height:auto;min-height:110px;padding:12px 14px;line-height:1.7;resize:vertical}
.yk-input:focus,.yk-select:focus,.yk-textarea:focus{outline:none;border-color:var(--c-primary)}
.yk-hint{font-size:13px;color:var(--c-muted);margin-top:8px}
.yk-msg{display:none;margin-top:16px;padding:12px 14px;border-radius:var(--r-sm);background:var(--c-primary-soft);color:var(--c-primary);font-size:14px}
.yk-msg.is-show{display:block}
.yk-form-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:6px}

/* ---------- faq ---------- */
.yk-faq-wrap{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:40px;align-items:start}
.yk-faq .accordion-item{background:transparent;border:0;border-bottom:1px solid var(--c-line)}
.yk-faq .accordion-button{
  position:relative;background:transparent;color:var(--c-ink);font-weight:700;font-size:17px;
  padding:20px 52px 20px 0;box-shadow:none;line-height:1.5;
}
.yk-faq .accordion-button::after{display:none}
.yk-faq .accordion-button:not(.collapsed){color:var(--c-primary);background:transparent;box-shadow:none}
.yk-faq .accordion-button:focus{box-shadow:none}
.yk-sign{position:absolute;right:4px;top:50%;transform:translateY(-50%);width:26px;height:26px;border-radius:50%;
  border:1px solid var(--c-line);display:inline-flex;align-items:center;justify-content:center;color:var(--c-primary);font-size:17px;line-height:1}
.yk-sign::before{content:"+"}
.yk-faq .accordion-button:not(.collapsed) .yk-sign{border-color:var(--c-accent);color:var(--c-accent)}
.yk-faq .accordion-button:not(.collapsed) .yk-sign::before{content:"−"}
.yk-faq .accordion-body{padding:0 52px 24px 0;color:var(--c-ink-2);font-size:15.5px}
.yk-side-card{background:var(--c-primary-soft);border-radius:var(--r-md);padding:28px;position:sticky;top:120px}
.yk-side-card h3{font-size:18px;margin-bottom:12px}
.yk-side-card p{font-size:14.5px;color:var(--c-ink-2);margin-bottom:18px}
.yk-side-card .yk-btn{width:100%}
.yk-side-card .yk-side-links{margin-top:18px;padding-top:16px;border-top:1px solid #D3DEDA;display:block}
.yk-side-card .yk-side-links a{display:block;font-size:14px;color:var(--c-primary);padding:6px 0}
.yk-side-card .yk-side-links a:hover{color:var(--c-accent)}

/* ---------- cta band ---------- */
.yk-cta-band{background:var(--c-primary-soft);border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);padding:52px 0}
.yk-cta-inner{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.yk-cta-inner h2{font-size:clamp(22px,2.6vw,30px)}
.yk-cta-inner p{margin-top:10px;color:var(--c-ink-2);font-size:15px}

/* ---------- footer ---------- */
.yk-footer{border-top:1px solid var(--c-line);background:var(--c-bg);padding:64px 0 28px}
.yk-footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px}
.yk-footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.yk-footer p{font-size:14px;color:var(--c-muted);line-height:1.85}
.yk-footer h4{font-size:15px;margin-bottom:16px;color:var(--c-ink)}
.yk-footer-links a{display:block;font-size:14px;color:var(--c-muted);padding:6px 0;position:relative;width:fit-content}
.yk-footer-links a::after{content:"";position:absolute;left:0;bottom:2px;height:1px;width:0;background:var(--c-primary);transition:width .24s var(--ease)}
.yk-footer-links a:hover{color:var(--c-primary)}
.yk-footer-links a:hover::after{width:100%}
.yk-footer-bottom{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:48px;padding-top:20px;border-top:1px solid var(--c-line);
  font-size:13.5px;color:var(--c-muted);
}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .55s var(--ease),transform .55s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1199.98px){
  .yk-hero-inner{grid-template-columns:1fr;gap:36px;padding:56px 20px 48px}
  .yk-hero-visual{max-width:560px}
}
@media (max-width:991.98px){
  .yk-section{padding:72px 0}
  .yk-section-tight{padding:52px 0}
  .yk-contact{grid-template-columns:1fr}
  .yk-faq-wrap{grid-template-columns:1fr;gap:28px}
  .yk-side-card{position:static}
  .yk-stats{grid-template-columns:1fr 1fr;row-gap:26px}
  .yk-stat:nth-child(3){border-left:0;padding-left:0}
  .yk-footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:767.98px){
  .yk-section{padding:48px 0}
  .yk-section-tight{padding:40px 0}
  .yk-section-head{margin-bottom:28px}
  .yk-hero h1{font-size:30px}
  .yk-hero-sub{font-size:15.5px}
  .yk-stats{grid-template-columns:1fr 1fr;gap:22px 0}
  .yk-stat{padding:0 18px}
  .yk-steps li{gap:16px;padding:22px 0}
  .yk-step-num{flex:0 0 46px;font-size:26px}
  .yk-timeline{border-top:1px solid var(--c-line)}
  .yk-tl-item{grid-template-columns:1fr;gap:0;padding:22px 0 22px 22px}
  .yk-tl-item::before{left:5px;top:0;bottom:0}
  .yk-tl-item:last-child::after{display:none}
  .yk-tl-dot{left:-1px;top:30px}
  .yk-tl-date{padding-top:0;margin-bottom:6px}
  .yk-tl-thumb{flex:1 1 100%;max-width:100%}
  .yk-tl-body{gap:18px}
  .yk-form-row{grid-template-columns:1fr;gap:0}
  .yk-panel{padding:24px}
  .yk-cta-band{padding:40px 0}
  .yk-footer{padding:48px 0 24px}
  .yk-footer-grid{grid-template-columns:1fr;gap:26px}
  .yk-logotext,.yk-logo-text{font-size:17px}
}
@media (max-width:575.98px){
  .yk-hero-actions{gap:12px}
  .yk-btn{padding:11px 18px;font-size:14.5px}
  .yk-stats{grid-template-columns:1fr}
  .yk-stat{border-left:0;padding:0}
  .yk-chiprow{padding:10px 16px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  [data-reveal]{opacity:1!important;transform:none!important}
  html{scroll-behavior:auto}
}